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For that frame size, most likely 170mm, but you can measure from the centre of the pedal spindle to the centre of the BB: A popular online bike shop lists available crank lengths of 165, 170, 175, and 180. Presumably if you buy the bike "ready built" it will come with cranks chosen to match the frame size. But 165mm cranks are relatively rare outside of ...


5

If you keep the rest of the bike the same a shorter crank gives more ground clearance at the bottom of the stroke, and that's going to be the main thing most people notice. You're unlikely to notice a change in power output unless you're shorter than, say, 1.7m, which would put you firmly on the down-slope of the power curve (ie, the part where longer = less ...


1

It affects several factors: The range of motion during the pedal-stroke Time per revolution (as a result of the increased radius) and the maximum torque a rider is able to put on the crank The majority of riders only pay attention to range of motion. For taller people and those with longer legs, longer crank arms are necessary to generate a larger range ...



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