jandamara
08-23-04, 09:50 AM
I've been looking at replacement chainsets on some sites, and they have differing sizes (eg. 170/175mm), what is this the size of ?
Bicycle Mechanics - Crank Sizes ?
Bikeforums.net is a forum about nothing but bikes. Our community can help you find information about hard-to-find and localized information like bicycle tours, specialties like where in your area to have your recumbent bike serviced, or what are the best bicycle tires and seats for the activities you use your bike for.View Full Version : Crank Sizes ?
Astra
08-23-04, 09:54 AM
It's the distance between the center of the bottom bracket axle and the center of the pedal axle :).
nolageek
08-23-04, 09:54 AM
It's the length of the arm.
Dusk
08-23-04, 09:57 AM
Your cranks should have a size stamped on them (backside sometimes) or you can just measure it with a mm tape.
MichaelW
08-23-04, 11:17 AM
Other dimensions to spec are the bolt circle diameter (smaller circles can accept lower gears), and the bottom bracket fitting: square taper Japanese or Euro, Shimano spline, ISIS spline.