Mountain Bike Crankset Length Calculator. Why should you buy a new crankset? Historically, bike riders have generally chosen proportionally shorter cranks for greater cadence cycling like criterium and track racing, while cyclists have selected proportionally longer cranks for reduced cadence cycling like time trial racing and mountain biking trails.
Many cranks carry markings identifying the length. I would like to propose a new system, which does take crank length into account. You can try this during a bike fitting.
More than ever people ask nowadays: "What gears to choose for my bicycle?".
Cranksets vary in chain ring size and number and in crank arm lengths.
Road cranksets are typically available in a wider size range than mountain bike cranksets. Why should you buy a new crankset? When it comes to mountain bikes, bike crank arm size isn't nearly as crucial.