Mountain Bike Crankset Length Calculator

An aspect often overlooked is crank length most of us happily riding the cranks supplied with the bike. Some people believe that the choice of crank length should be based purely on function e g. When setting up our bikes we make sure that all aspects of the bike are dialled into our functional anatomy for maximal comfort and best performance such as saddle height reach shoe pedal interface and that all important well fitting saddle.

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It really isn t too difficult to get the chain length right.

Mountain bike crankset length calculator. Mountain bike crank length was simply transferred from whatever road bikes were using in the 80 s and haven t changed much since. Most mtb cranks are 175mm long but riders with legs shorter or longer than the average may feel more comfortable on cranks that better match their measurements. Shorter cranks offer better pedal clearance and work best for riders with short legs. Road cranksets are typically available in a wider size range than mountain bike cranksets.

The correct chain length chain rivet. Understanding the best mountain bike cranks. Road bike cranks are available in a lot more lengths than they were in 1985 so why aren t there shorter cranks on mountain bikes. I would like to propose a new system which does take crank length into account.

165mm 180mm in 2 5mm increments 11s dura ace shimano mountain. This system is independent of units being expressed as a pure ratio. The first mountain bikes were built from pirated road bike parts. Longer cranks offer more leverage and are good for riders with longer legs.

Old school 3 9 or more and more popular 2 10 or perhaps the newest addition by sram xx1 1 11. A brief perusal of various cycling forums will usually find ambivalence to crank lengths with various comments such as i ve got 170mm on one bike and 175mm on the other and can t tell any difference between them. The traditional crank length on a mountain bike is 175mm but 165 170 and 180mm cranks are also sometimes available. Options from 165mm to 180mm cover different limb lengths it could be worth your while to research what crank length is recommended for your inside leg measurement.

All you need are a chain rivet or a chain lock and you will need to know the amount of chain links needed for a correct chain length. Femur length in inches should be the same as crank length in cm alternately femur length in cm divided by 2 54 equals crank length yields the same result this is based around the idea that the upper leg is the major lever when applying force to the pedals and that the lower leg is the connecting rod and plays little part. 165 180mm in 5mm. What gears to choose for my bicycle.

More than ever people ask nowadays. If the mountain bike has 175 s and the road bike 170 s the gear on the mountain bike is really about 3 lower. Take your old chain and lay it out next to the new one. 175mm for mountain bikes and 165mm for the track.

You can use either of these two methods.