ท่านที่ถาม BIKE SETTING ..........fitting
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มีบางสำนักที่ดึงจุดการทำงานของร่างกายถึง20จุด .................................แต่ที่แตกต่างกับของผมที่ดึงสูงกว่า20จุด โดย กำหนดจุดเซ็ทที่รถ10จุด ซึงของต่างประเทศ จุดปรับตั้งที่รถมีไม่กี่จุดเท่านั้น ........ซึงยังมีบางสำนักก็ยังไปยึดติดที่ขนาดของเฟรมเสียอีก.....มีบางสำนักพูดเสียมากมาย แต่ที่ตัวรถไม่ได้บอกต้องปรับอะไรต่อ ...........แล้วที่สำคัญเขาเซ็ทเฉพาะท่านั่ง...........ไม่ได้เซ็ทชุดขับเคลื่อนให้ทำงานสอดคล้องกัน ..................................เมื่อของเราปรับที่รถตั้ง10จุด ทำให้ร่างกายต้องใช้มากกว่า20จุด ไม่มีรถสำนักไหนในโลกนี้ที่ขี่แล้วร่างกายเฟริ์มทุกส่วน นักจักรยานต้องเข้าฟิตเนสไปฟิตร่างกาย แต่ที่ เอ็ม เจ เฟริืมทั้งหมดยกเว้น ซื้อไปแล้วขี่วันละ 5โล10โล ......ถ้าขี่วันละ20กมขึ้นไป2วันพัก1วันเสาร์ อาทิตย์ขี่ยาวสัก60-70กม 3000กมก็เฟริ์มแล้วครับ
Bike Fit
The most overlooked aspect of riding is a proper fitting bike! With department stores offering little or no advise for sizing your bike, many people end up riding a poor fitting bike. Regardless of what kind of bike you own or what type of riding you do, the most important feature is that your bicycle fits you properly. Improper bike size and set-up can create knee, neck and back pains, making riding uncomfortable. Conversely a proper fitting bike will make cycling easier and more enjoyable. The best thing to do is head for a real bike store (or cyclery) and ask to be fitted to your existing bike, or be correctly fitted to a new bike. Many bike shops will adjust seat and handlebar height and angle, some even offer a detailed fit procedure called a "Fit Kit" this is designed for the more advanced riders to improve performance, but will benefit anyone who rides.
Fit Basics
There is no standard sizing or fit, everyone will be different. The right fit for you will depend on your body geometry and how aggressive you want to ride. To get the right bike fit, you have to do 2 things:
1) Spend some time riding and testing different set ups. Move the saddle and handle bars into a few different positions. Then try each one with a short ride, this leads to the second thing to do.
2) Pay attention to any aches or pains as you ride. For example, back pain may be caused by leaning to far forward, sore knees are due to a saddle adjustment.
The following are some suggestions for fitting your bike properly, which should provide you with a starting point. If after adjusting your bike you still feel un-comfortable, maybe you should visit your local bike shop for more help.
Step #1 - Check your frame size
Please note these are good guidelines for initial set up and fit, but should not be considered precise or exact in any way. Again everyone's body is a little different and having a good bike shop fit you is still recommended. The first thing is 2 rules of thumb to determine bike height. To determine this yo must step over top of the bike and stand with one leg on each side hands on the handle bars. In this position you want to gently raise the front end of the bike up until the top tube is touching you. For road bikes the clearance from the floor to the tire should be roughly 1 to 1-1/2 inches, for a mountain bikes generally 2 to 3 inches. Again this is just a rough guideline and will help narrow the search. Note that on Mountain bikes the full suspension bikes tend to ride higher and will sit 1-2 inches.
Step #2 - Positioning your saddle
Saddles move in 3 directions, up/down, fore/aft, and Tilt. Everyone's saddle position will be different because of personal preference, riding style, and body geometry. The following three positions will greatly affect your riding. You will need to try a few different positions to decide which is best for you. Remember if you feel any discomfort chances are your positioning is wrong, try again or seek the aid of a professional bike shop employee.
Saddle Position #1 (fore/aft)
The fore/aft position of your saddle can have a significant effect on your body position while you ride. To check this, sit on your saddle using a stationary object to keep yourself balanced and rotate your pedals until they are horizontal (at the 3 o'clock and 9 o'clock positions). You will need a piece of string about 30 inches long with a weight tied to the end (like a pencil). Now using the foot in the 3 o'clock position place the string on the small bony bump just below your knee cap and let it hang straight down to the foot. With a properly positioned saddle the pencil should line up with the axle of the pedal. To adjust this simply loosen the seat post binder bolt and slide your saddle forward or backward, then re-tighten the bolt securely before riding.
Saddle Position #2(height)
Correct saddle height will provide you with hours of enjoyable riding. It will lower the stress on your knees and provide the most power to your pedals. Your saddle height should be set so your legs almost (but not quite) fully extend at the bottom of each pedal stroke. To check for correct leg extension, rotate your pedals to the 12 o'clock and 6 o'clock positions (while sitting on your saddle). The bottom leg (6 o'clock position) should have a slight bend in the knee.
To adjust your saddle height, loosen the binder bolt (or quick-release lever) located where the seat post and frame meet. Slide the seat post up or down in the seat tube as needed, being careful not to raise it beyond the "minimum insertion mark" (already etched into its side). Straighten out the saddle and re-tighten the binder bolt ( or quick-release lever) securely before riding.
Saddle Position #3 (tilt)
When it comes to saddle tilt some cyclists prefer a forward tilt, or a backward tilt, and some people like their saddles completely level. To find a tilt position that works for you, start with the saddle completely level to the ground (horizontal) take a few test rides, try some different angles. To tilt the saddle, simply loosen the binder bolt directly under your saddle, make your adjustments and re-tighten.
Step #3 - Positioning you handlebars
Handlebar position will effect your comfort while riding. There are 2 positions to consider for handlebars
1.) Height - this will determine how upright you sit, a taller handle bar will allow you to sit more upright, for a more comfortable ride. a lower handle bar will give you a more aggressive handling bike, good for off road trails.
2.) Length of stem - this will determine how stretched out your upper body will be, a longer stem will cause you to stretch out more.
Again everyone's positioning will be different! Depending on the type of riding you do, and your body's geometry. To find the best height for you, start with your handlebar about 1 inch lower than the height of your saddle. Ride for a while with the bars in this position, and see how your body reacts. If your lower back starts hurting and you may want a more upright position (raise your stem slightly).
Adjusting your handlebar: (For standard quill style stems)
1.) Loosen the stem expander bolt located at the top of your handlebar stem (the bolt head should be clearly visible) until it's about 1/4 inch above the top of the stem. Be careful not to loosen this bolt any further, or the expander nut (hidden inside your stem) may stay inside the forks
2.) Tap the top of the expander bolt, sharply with a rubber mallet (or place a block of wood on top of the bolt and use a regular hammer). You should now be able to rotate the handlebars and move the stem up or down.
3.)Align & Re- tighten Holding the front wheel in between your knees, reposition the stem and handlebars up or down as needed, then re-tighten the stem expander bolt firmly.
NOTE: Be sure NOT to raise your stem beyond the maximum insertion mark etched into its side. Also some types of brakes may need to be readjusted each time you move your handlebars. Bikes equipped with the "Ahead" style stems have a limited amount of adjustment and may require a new stem or handle bar.
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Choose Your Fit
A Bike Sizing is included with the purchase of every bike.
A sizing addresses 3 essential points of fit.
The Full Body Geometry Fit begins at 15 points of fit.
FULL FIT: This fit experience is best suited for those looking for the perfectly fitting bicycle.
Our Full Fit starts with documentation of your current fit. This is followed by a brief interview regarding your cycling history, your cycling goals and any past injuries on and off the bike which may directly affect your flexibility and ultimate comfort on the bike as it relates to the three contact points on the bike: the feet, your rear end and hands.
20-Point Flexibility Assessment: This series of evaluations provides an accurate picture of your flexibility and other physical attributes that will determine your final riding position. Assessments include foot structure, knee position, spinal curve, and hip flexion, among others.
Side View Analysis: By assessing the side view of you on your bike, your fitter will establish a correct neutral position that's both powerful and comfortable by precisely adjusting seat height, handlebar height, stem length and cleat position.
Front View Analysis: Analysis from frontal view will optimize your hip, knee and foot alignment for greater performance and balanced power delivery. Includes analysis of pedal and shoe placement and squareness on the saddle.
Follow Up: After a week or so, our technician will call you to discuss the effectiveness of the adjustments and answer any other questions and concerns.
Cost: $250.00
Time: approximately 2 hours
What to bring: Current bike, shoes, pedals, jersey, shorts, gloves, towel and water bottle.
BASIC FIT: This fit experience is suited for any cyclist looking to get the most out of his or her bike.
Our Basic Fit starts with documentation of your current fit. This is followed by a brief interview regarding your cycling history, your cycling goals and any past injuries on and off the bike which may directly affect your flexibility and ultimate comfort on the bike as it relates to the three contact points on the bike: the feet, your rear end and hands.
With this in mind your Basic Fit session will include:
Side View Analysis: By assessing the side view of you on your bike, your fitter will establish a correct neutral position that's both powerful and comfortable by precisely adjusting seat height, handlebar height, stem length and cleat position.
Front View Analysis: Analysis from frontal view will optimize your hip, knee and foot alignment for greater performance and balanced power delivery. Includes analysis of pedal and shoe placement and squareness on the saddle.
Follow Up: After a week or so, our technician will call you to discuss the effectiveness of the adjustments and answer any other questions and concerns.
Cost: $100.00
Time: approximately 1 hour
What to bring: Current bike, shoes, pedals, jersey, shorts, gloves, towel and water bottle.
TRI FIT:
Our Full Fit starts with documentation of your current fit. This is followed by a brief interview regarding your cycling history, your cycling goals and any past injuries on and off the bike which may directly affect your flexibility and ultimate comfort on the bike as it relates to the three contact points on the bike: the feet, your rear end and hands.
20-Point Flexibility Assessment: This series of evaluations provides an accurate picture of your flexibility and other physical attributes that will determine your final riding position. Assessments include foot structure, knee position, spinal curve, and hip flexion, among others.
Side View Analysis: By assessing the side view of you on your bike, your fitter will establish a correct neutral position that's both powerful and comfortable by percisely adjusting seat height, aerobar reach, pad width and stack, stem length and cleat position.
Front View Analysis: Analysis from frontal view will optimize your hip, knee and foot alignment for greater performance and balanced power delivery. Includes analysis of pedal and shoe placement and squareness on the saddle.
Follow Up: After a week or so, our technician will call you to discuss the effectiveness of the adjustments and answer any other questions and concerns
Cost: $300.00
Time: 3 Hours
What to bring: Current bike, shoes, pedals, jersey, shorts, gloves, towel and water bottle.
AERO BAR FIT: For those who are adding an aero position to their bike
The Aero bar fit indludes:
Side and front View Analysis: By assessing the side and front view of you on your bike, your fitter will establish a correct neutral position that's both powerful and comfortable by percisely adjusting aerobar reach, pad width and stack, stem length.
It is highly recommended that this fit is done to a bike that has already had a full Body Geometry fit adjustment.
Please note: an Aero Bar Fit does not include installation of the bars themselves.
Cost: $40.00
Time: 1/2 Hours
What to bring: Current bike, shoes, pedals, aero bars and shorts.
CLEAT ADJUSTMENT FIT: For those who want an effective and healthy foot position
The Cleat Adjustment Fit includes:
Side View Analysis:To check for neutral cleat placement for cleat fore and aft, assessing foot rotation and frontal view for Q-angle, as well as insole consultation.
Please talk to one of our fit staff before scheduling a Cleat Adjustment Fit to make sure the process will be effective.
Cost: $40.00
Time: 1/2 Hours
What to bring: Current bike, shoes, pedals and shorts.
MEET YOUR BG FIT EXPERTS
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Noob Guide to Geometry, Bike Fit and Handling
Geometry: A lot of people make a big deal about a frame's geometry and for good reason - because it effects bike fit and handling. Changing a bike's geometry can make a bike more capable at climbing or descending; turning; more or less stable; more or less comfortable; and more or less efficient.*
There are a lot of variables to consider when designers develop a frame and, like chaos theory, changing one little variable can drastically effect the outcome of the overall fit and handling of a bike. The good news is, as long as you are within the ballpark of frame size and type, you can change what I'll call the "effective geometry" of a bike without cutting up the frame and welding (or gluing) it back together. I call it the effective geometry because you are not changing the geometry, just the angles in relation to the rider. This is accomplished by changing or adjusting some of the parts that bolt onto the bike. I'll touch on those areas as I explain them in relation to the frame.
For beginners, disecting a frame's geometry can be a little too far in the weeds when choosing a bike. View the following as an extremely generalized guide to help you understand why one bike may feel different than another and give you an idea as to what people are talking about when they throw around esoteric terms while discussing the mystery of frame design.
For the most part, certain categories of bikes have a specific type of geometry and each is within a pretty close range of one another. Cross country bikes are pretty close to other cross country bikes' geometry and same goes for all mountain vs AM and down hill compared to other DH bikes. But cross country bike geometry is a lot different than a down hill bike's geometry. Manufacturers tweak their designs within each category to give specific types of fit and handling because some people prefer a certain type of geometry over another because of their body dimensions or riding style.
There are four basic areas of a frame's geometry that will effect the way it rides: head tube, top tube, seat tube and chainstay. See diagram below:
Let's start with the front of the bike.
The head tube. There are two measurements to be concerned with: the head tube length and the head tube angle.
Head tube length can be important if you want a really aggressive (low) handlebar position or a really relaxed (high) handle bar position. You can alter the handlebar position with more or less spacers on the steering tube, but only within limits (the steering tube is the part of the forks that goes through the head tube and connects to the stem and handlebars). So, for the most part, a short head tube, with no spacers, will allow you to get lower than a longer head tube with no spacers.
Since the number of spacers you can use has limits, some people need or want a longer head tube to get a sufficiently upright position, just as some prefer the short head tube to get a sufficiently aggressive riding position. Some bikes with a short head tube ship with a long steering tube and a lot of spacers to allow you to determine how aggressive of a riding position you want. Others will cut it low assuming you want an aggressive riding position.
Note: You cannot lengthen a steering tube once it has been cut - you must buy a new set of forks, so, make sure you like the handlebar position before you go cutting off that steering tube! If the bike comes with a short head tube and steerer tube and you want a more upright position, you can buy a set of riser bars. Or, if it's too high, you can go the other way and cut the steerer tube or buy a set of flat bars. Because 29ers' head tube sits higher than a 26ers' head tube, some people are slamming the stem and/or turning it upside down with flat bars to get the aggressive riding position they are used to having with a 26er.
This begs the question, "what's the difference between an aggressive and relaxed riding position?" In short: aerodynamics, leverage and comfort. The lower you are, the more aerodynamic with greater leverage to pull up on the front wheel (and arguably less comfortable and less stable) compared to more upright. So, it's a trade and depends on what is more important to you.
Head tube angle. For the most part, the more a bike looks like a chopper, the more stable it will be while riding in a straight line. This is why downhill and all mountain bikes have "slack" HT angles - for stability. The less chopper-like the bike gets, the faster it will steer and turn. Careful though, not enough head tube angle and the bike will be twitchy (difficult to ride with no hands) and you'll also likely to be over the bars often.
Depending on the category of riding a bike is designed for, the angle of the head tube will be within a certain range. XC bikes have a steeper HT angle compared to All Mountain (AM) and Downhill (DH) bikes. Generally, entry-level XC bikes will be a little more slack than race XC bikes.
However, one can change the "effective" HT angle (slackness/stability and steering speed) by increasing or decreasing the length of the forks. Not all forks are adjustable. However, some are designed and built to allow a rider to change the fork length (travel) by +/- 20mm. This is typically accomplished by altering the travel, or, the distance a suspension fork can compress. A segment of adjustable forks even have a way to adjust the travel (and therefore fork length) with a couple twists of a knob. When you increase or decrease the travel, you are raising or lowering the head tube. In doing that, you are increasing or decreasing the "effective" head tube angle and changing the angle of the forks. Comparatively longer travel will make a bike more slack. Be careful though - if you change the travel more than +/- 20mm, you will void the warranty because you are putting additional stress on the head tube and you might cause it to break.
Another way is to buy a special "adjustable" headset. The headset is the compilation of bearings and spacers in the head tube. An adjustable headset allows one to adjust the steerer tube angle within the head tube +/- 1.5 degrees. It might not sound like a lot, but 1.5 degrees in either direction can really change the way a bike rides.
It is also possible to speed up or slow down the steering or twitchiness a couple of ways without changing the travel or HT angle. Putting a longer stem on a bike and/or widening the bars slows the steering down just as a shorter stem and/narrower bars speed it up. This is like the difference between a small steering wheel on a sports car and a big steering wheel on an 18-wheeler. It doesn't actually change the ability of the bike to steer quicker or slower, it just feels like it.
Changing either the stem or handlebars, or both, will also change your effective reach and put you in a more or less aggressive riding position. Longer stem means you have to bend over farther to reach the grips. Wider bars have the same effect. This may or may not be what you want. You can counter this by moving your saddle forward or backward to compensate for the change in reach. Again, you have to be careful making changes because moving your seat position also changes your effective seat tube angle and, in an essence, also changes the effective top tube length.
Which brings me to effective top tube length.
They call it that because the actual top tube length is the measurement of the top tube from the middle of the seat tube, through the middle of the top tube, to the middle of the head tube. The effective top tube length is the measurement of the middle of the seat tube, parallel to the ground, to the middle of the head tube. The reason these two measurements are different are the same reasons Pythagoras has his own Theorem. More on the importance of top tube angle in the discussion about seat tube length and stand over height later.
A shorter or longer ETT will dictate how cramped or stretched, or how upright or aggressive the cockpit feels. If you are a person with long legs and a short torso, you'll likely want a shorter ETT. This is also desirable for people who prefer a more upright seating position. The seat tube angle also plays a part in the ETT measurement. The more relaxed seat tube angle, the longer the ETT. Generally, an entry level bike tends to have a shorter ETT and a more relaxed seat tube angle because this allows a more upright seating position. This makes the front triangle of the frame shorter than a race bike which typically has an upright seat tube and longer ETT to give an aggressive riding position.
Nevertheless, you can customize cockpit length by moving your seat +/- 1.5, inches, which is a common adjustment. In extreme cases, some people opt for a "laid back seat post" which is a seat post with a backward bend in it to give a little more room in the cockpit. This can give another inch or two of rearward seat adjustment. *I've also seen people use a laid back post to bring the seat forward, but I don't recommend you do it.
When moving your seat forward or backward, you are changing the "effective" seat tube angle (a term I think I made up a long time ago) which is responsible for the position of your butt in relation to the bottom bracket. This measurement is important because it will dictate the weight distribution of the bike while peddling.
Moving your saddle forward shifts your weight forward, which can make climbing a little easier by keeping the front tire from popping up on you. However, it can also reduce traction during climbs and, on the flats, it will add a little more pressure on the wrists and hands and makes popping a wheelie a little more difficult. Moving your seat back shifts your weight*back, which, conversely, *puts more weight on the rear wheel and increases traction. This can also make climbing while in the saddle a little easier, but it can also cause you to loop out on steep climbs in low gears.
Lastly, a more relaxed effective seat tube angle is a little more comfortable as it will soak up bumps a little better by letting your seat post flex instead of sending the force of a bump straight up the seat post and into your back.
When adjusting your seat, make sure your "sit bones" rest on the back of the seat. This will take some pressure off your pelvis and make riding more comfortable (There are different width seats for custom fit) This will also give you some room to adjust your weight forward by sitting on the front of the saddle when climbing.
Some bikes have a top tube that is more parallel to the ground than others. This is mostly determined by the seat tube length.*
The extreme examples are XC bikes compared to trials and jump bikes. Trials and jump bikes have a steeper top tube angle to give more clearance between one's groin and the top tube. This allows the seat to be low*and out of the way (or eliminates it in the case of a trials bike). XC bikes have a top tube closer to parallel with the ground to support a raised saddle. In XC, you want to have your saddle in a position for maximum peddling efficiency when seated. This is achieved by having your leg almost at near full extension when the pedal is in the full downstroke position.
Note: The best way to find the right seat post height is to sit on the bike with the right-side crank in the five o'clock position. With riding shoes on, put your heel on the pedal spindle. If your right knee is bent, your seat is too low. If you are stretching or reaching to touch the spindle with your heel, your seat is too high.
For XC, if your seat tube length is short and you have long legs, you will need a long seat post. If your seat post sticks up too far past the top of the seat tube, it will break, or it will break the frame. Seat posts are marked with a maximum height. Do not exceed this height. If you must exceed the height, you need a larger frame.
If you are short and your seat tube is long, you won't be able to stand over the bike without your crotch painfully straddling the top tube - which is where the "stand over height" measurement comes from.
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A lot of attention is given to stand over height, which is important, but, arguably, less important than ETT; because, hopefully, you spend more time riding your bike than straddling it. It gets the most attention because most manufacturers sell frames in sizes according to seat tube length and stand over height. A general rule of thumb is to have two or three inches between "you" and the top tube. But this doesn't always give the best fitting frame. Worse is when they recommend a bike size according to height. Most times this is okay, but, sometimes it's really bad.
Remember the rider with long legs and short torso needing a shorter ETT? Well, paying attention to height or stand over only would possibly recommend a frame too large. Conversely, having short legs and a long torso will require a longer ETT. Sometimes this will result in a larger frame choice that will be grazing the rider's crotch when standing over. However, the cockpit*will be more comfortable when riding compared to a smaller size that gives two or three inches stand over clearance and a hump back. Of course, this can all be "fixed" with a laid back seat post, a longer stem and a set of wide bars - but it isn't ideal.
The last area of discussion is chain stay length.
This area effects stability, agility and weight distribution. The shorter the chain stay, the easier the bike will be to wheelie and the more nimble it will feel. Too short and it will loop out on climbs. Longer chain stays make the bike track in a straight line better. Taller guys riding larger bikes with a relaxed seat tube angle and a long seat post typically need longer chain stays to keep from having too much weight on the rear wheel.
Those are the four basic areas of geometry and how they relate to handling and fit. As you probably noticed, the frame is just a starting point and the parts you bolt to it can change the handling and fit.*
Now, let's take a minute and imagine an interactive graphic of a rider on a bike that allows you to*drag each of the areas we discussed and how it makes the bike and rider look. Drag out the front wheel, pull the top of the seat tube toward the rear wheel, make the seat tube longer, make the top tube shorter. You see how changing one changes almost all?
I made sure to stay away from including angles and inches because different sizes, different constructions and the parts bolted to a frame can move some bikes into different categories. Some XC bikes have slack head tubes. You can make an AM bike a decent XC bike.
The short of it is, geometry is relative. It's impossible to understand a frame's geometry without putting it into context. It's more of a comparative analysis. Get a bike based on your height and standover and category. As you ride it, you can customize it. If you find yourself wanting your bike to perform a way that can only be accomplished outside the adjustable limits of your current bike, look for a frame with that geometry. If you see a bike that you want, let us know what you plan to do with it and we can help you understand if it is appropriate. For the most part, you can just look at a bike and understand what the category is.
Last edited by wmac; 12-03-2012 at 08:48 AM.
No, YOU don't understand. You're making an ass of yourself for all of eternity.
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11-30-2012 #2
Trail Ninja Trail Ninja is offline
I build my own.
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Thank you once again sir. Mods, please sticky.
I have a device that can access the total knowledge of man. I use it to look at pictures of cats and argue with strangers.
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11-30-2012 #3
zicked zicked is offline
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I'm not a noobie, but reading this made me feel like one. Excellent info that will help me identify "effective" changes I can make to my bike now and what to pay close attention to when scoping out the next one. Thanks!
Please don't mistake my enthusiasm for mountain biking as an indication of my skill level.
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12-01-2012 #4
moclan moclan is offline
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Absolutely a post hit subject! thank you!
Now if only it was as easy to do the try outs needed to get things right without buying a lot of "bits" ...
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12-02-2012 #5
akaBrowntown akaBrowntown is online now
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Good read.
Im in that fuzzy area of most bikes between M-L, chose the medium so it would be a bit more comfortable on long rides... and weighs less.
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12-02-2012 #6
sliebsch sliebsch is offline
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12-03-2012 #7
zephxiii zephxiii is offline
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Dang this should be stickied, great job
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12-03-2012 #8
wmac wmac is offline
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Thanks - Rep it if you like it
No, YOU don't understand. You're making an ass of yourself for all of eternity.
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12-03-2012 #9
FlyingEye FlyingEye is offline
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Very useful information wmac. I'm getting my bike fixed. Front and rear suspension are going to be new. This information comes at a great time. thanks
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12-06-2012 #10
woodsgroovin woodsgroovin is online now
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Thanx wmac
Reading this has been time well spent.
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12-06-2012 #11
mimi1885 mimi1885 is offline
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Good job wmac.
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12-07-2012 #12
zebrahum zebrahum is offline
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"You must spread some reputation around before giving it to wmac again"
I'll get you eventually, thanks for taking the time.
Don't you hate it when a sentence doesn't end the way you think it octopus?
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12-07-2012 #13
Oldfatbaldguy Oldfatbaldguy is offline
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I'm not experienced in any skin but mine, but it took me 20 years of trial and error to learn most of what was covered in a 5 minute read. I am pretty close to knowing if I could be happy on a bike just from looking at the geometry numbers, but I doubt if I could help another without taking a few rides with them.
Where were the guys like this 30 years ago?
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12-07-2012 #14
wmac wmac is offline
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Quote Originally Posted by Oldfatbaldguy View Post
I'm not experienced in any skin but mine, but it took me 20 years of trial and error to learn most of what was covered in a 5 minute read. I am pretty close to knowing if I could be happy on a bike just from looking at the geometry numbers, but I doubt if I could help another without taking a few rides with them.
Where were the guys like this 30 years ago?
I was racing BMX
No, YOU don't understand. You're making an ass of yourself for all of eternity.
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12-08-2012 #15
elvisagain elvisagain is offline
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*Excellent post. Helped me a lot.
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12-12-2012 #16
mtnking mtnking is offline
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Good info
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12-12-2012 #17
RTM RTM is offline
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another..."You must spread some reputation around before giving it to wmac again"
but man, noob or not, that is good information. I learned a lot.
"The bitterness of poor quality remains long after the sweetness of a low price is forgotten." - Benjamin Franklin
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12-20-2012 #18
wmac wmac is offline
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Thanks everyone.
No, YOU don't understand. You're making an ass of yourself for all of eternity.
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01-06-2013 #19
wmac wmac is offline
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Anyone have anything to add to this?
No, YOU don't understand. You're making an ass of yourself for all of eternity.
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01-06-2013 #20
mimi1885 mimi1885 is offline
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Do you mind putting the "over mountain" geometry up for comparison. I'd rep you again but was told to spread more love before I can do it.
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01-07-2013 #21
Katz Katz is online now
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I won't be able to rep you for a while, but I'll make sure to do it.
Quote Originally Posted by wmac View Post
Anyone have anything to add to this?
BB height. Good comparison would be between DJ/slalom bikes and trials bikes. The geometries are pretty similar with the exception of noticeably different BB height. DJ/slalom bikes usually have BB drop with 100mm suspension forks, whereas trials bikes have BB above the rear axle with short rigid forks.
Lower BB, lower your center of gravity = better cornering.
Higher BB, easier to pop the front wheel up by weight transfer (bunnyhop, manual), better clearance on obstacles, etc.
There may be other effects I'm not aware of.
EDIT: Higher BB also makes the bike more stable when you are standing on the rear wheel. Obviously this is irrelevant unless you are actually into trials.
reference: Bike Trials Geometry Guide - at WebCyclery|WebSkis|Bend, Oregon
For typical riding style (XC, AM, etc), it's better to have the BB as low as practically possible. This obviously is affected by the amount of rear suspension travel you have, crank length, as well as the type of terrain you ride.
Last edited by Katz; 01-12-2013 at 08:11 AM.
Bike pics and vids
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01-07-2013 #22
wmac wmac is offline
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Ah, nice add Katz!
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01-09-2013 #23
Sno Sno is offline
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great read put things in perspective.
Floridasportbiker.us
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02-04-2013 #24
wmac wmac is offline
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Thanks Sno!
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02-06-2013 #25
Danielrg_usa Danielrg_usa is offline
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It won't let me rep you right now. Thanks for the info. Is there anywhere that I can find a chart or something that has general geometry numbers for the different types of riding disciplines?
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