Mountain Bike Crank Length Guide

175mm to 170mm cranks is about a 3 reduction in length so you d probably barely even notice. The industry is still supplying bikes for riders of my height of 177cm 5 10 with the same length cranks some 20 years later. For years most cyclists assumed that crankarms came in one size.

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Welcome to our site! Here we have a plenty of mountain bike crank length guide for you as your basic idea in your next Action! Feel free to download the image and use it as your guideline. However, the free mountain bike crank length guide images provided below is not given in a detailed manner.

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Most stock bikes have cranks of 170mm or 175mm but you can get them as short as 140mm and as long as 190mm.

Mountain bike crank length guide. Check both axle diameter and spline pattern to ensure that your existing sprocket will fit on your new cranks. The default or standard crank arm length is 175mm on mountain bikes and is always measured in millimeters. While some brands spec 170mm cranks it is often only on their smallest sizes. What has changed however is a greater understanding of human mechanics in cycling and the upshot of findings is that swapping out to a shorter crank by at least 5mm.

Chainring choices aside road bikes have long come with 172 5mm crankarms regardless of frame size while stock sizing for mountain bike crankarms is generally 175mm. As others have said try different legnths if you can and see what is most comfortable for you. If we look at the crank sizes fitted to bikes sold in the uk the majority are now on 172 5mm. The one on their bike.

Why your mountain bike crank length is likely too long. Crank arm lengths range from 165 180mm increasing in 5mm increments. With few exceptions most xc and trail oriented mountain bikes shipped today come with 175mm cranks. The size of your mountain bike crank arm should be proportional to your leg length.

Smaller frames and women specific frames both may come with shorter crank arms usually 165mm. One could also suggest the cycling industry is indifferent to crank length as the range of available sizes is quite narrow often just 170 175mm. This is measured from the centre of the bottom bracket axle to the centre of the pedal axle. Therefore if you have little legs go for shorter crank arms.

What you need to know about crankarm length. To be really sure what size mountain bike crank arm you should be using you can get a bike fitting at a shop. The only time you really need to be sized for your bike or need to be worried about crank arm size is if you are doing long rides in the saddle but since with trail enduro riding you are constantly in and out of the saddle and getting breaks on the descents we find 170mm length to be the perfect size.