Mountain Bike Crank Arm Length Calculator. A good bike fitter will help you find the best crank arm length for you. Moving to a shorter crank can improve: Comfort: A shorter crank length reduces range of motion at the knee (extension and flexion), hips, and low back. • Crank length: This is measured from the centre of the bottom bracket axle to the centre of the pedal axle.
Some bike manufacturers are wise to this though, and fit different length cranks on different size bikes. Got longer or shorter than average legs, you need longer or shorter cranks. Q Factor is the distance between the outside of one crank arm to the outside of the opposite crank arm.
Please Subscribe God Bless:) I answer the following questions in this video How can I measure my bikes.
Q Factor is the distance between the outside of one crank arm to the outside of the opposite crank arm.
Although Q Factor has become a universally recognised measurement, other people in the bike. A larger Q Factor (wider tread) will mean less cornering clearance (while pedaling) for the same bottom bracket height and crank. You can try this during a bike fitting.