All Mountain Bike Parts Descriptions
#14) Cranks - The main drive, from legs to wheels.
Cranks change your leg power to wheel
motion and with the rest of the drivetrain, can be
up to seven times more energy efficient than walking.
So if I had a great hike and walked 10 km's, I could
have rode 70 km's with the same amount of energy.
They come with single, double, or triple chain
rings. Large rings for driving the bike at high torque
speeds (low gear) or slower, low torque speeds (high
gear). Ring sizes vary from 22 teeth to 50 teeth or
even larger for track bikes. Like the bottom brackets
they are designed to fit only certain axles shapes
Cranks take alot of abuse, not only from the
riders weight on them, but also from smacking off
rocks and things, even impacts on the pedals, so they
are usually overbuilt with beefy hardened alloys or
tubular chromoly steel.
Bike Parts Diagram