What is Crank Length?

sandalscout · Oct 30, 2007

Sorry to keep bombarding this forum, but I'm pretty new to much of this.. It's very straight forward, but nomenclature and wording are getting me.

Anyway, what exactly does crank length determine? IE, I discover that my cranks are pretty badly corroded under the paint, so I've decided to replace them with:

http://www.bikeworldusa.com/product_inf ... cts_id/467

but, what size do I need? The arms are about 6" long from end to end, and the center section is 3.5" from thread to thread (normal, right?). The size is what exactly? The length of the arms from the center section to the end of the arm where the pedals mount? Or am I missing the point?

Thanks!

user 135 · Oct 30, 2007

you should be fine with the 6.5" cranks if your cranks are 6". That equals a 165mm.

What bike is this for? I haven't measured mine recently but I think they are mostly 175mm on 26" wheeled frames.
http://www.bikepartsusa.com/product_inf ... 01%2D97872

Misfit43 · Oct 31, 2007

What's nomenclature?!!! :shock: :shock: :shock:

new_dharma · Oct 31, 2007

most crank lengths are metric (in mm if that helps) & measure the length of the bottom bracket it-self

sandalscout · Oct 31, 2007

cman, thanks! I just wasn't sure if the length was the length of the arms, or something else... I'm going to go with 6.5" This is for my western flyer Trophies, huffy frames.

Misfit: Nomenclature = terminology, nomenclature, language (a system of words used to name things in a particular discipline) "legal terminology"; "biological nomenclature"; "the language of sociology"