Mountain Bike Crank Arm Length
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Xc possible sizing needed depending on ride lengths but 175 s are what is recommended for more leverage.
Mountain bike crank arm length. Go into any mountain bike shop and chances are every bike in there will come with 175mm or 170mm crank arms with 175mm usually found on m xl sizes and 170mm found on xs s. For years most cyclists assumed that crankarms came in one size. Sizes go up by 5mm. The standard mountain bike crank arm length is 175mm.
However smaller frames and ladies bikes are generally 165mm. Chainring choices aside road bikes have long come with 172 5mm crankarms regardless of frame size while. A good bike fitter will help you find the best crank arm length for you. You can try this during a bike fitting.
With few exceptions most xc and trail oriented mountain bikes shipped today come with 175mm cranks. Bicycle cranks may vary in length to accommodate different sized riders along with unique kinds of biking. However the evidence leans towards mountain bike crank lengths being too long in general. Trail enduro 170mm crank arm length is the most commonly used size and is recommended to keep a good leverage ratio and have a bit more ground clearance due to having more travel.
The bigger bicycle part manufacturers typically provide crank lengths for mature riders from 165 mm to 180 mm extended in 2 5 millimeter increments with 170 millimeter cranks being the most frequent size. The one on their bike. While some brands spec 170mm cranks it is often only on their smallest sizes.