Re: [CR]Crank length, today and yesterday


Example: Production Builders:Peugeot:PY-10
From: "nath" <ferness261@voyager.net>
To: "garth libre" <rabbitman@mindspring.com>, <classicrendezvous@bikelist.org>
References: <001601c14225$3212ca80$b2bc56d1@Marta>
Subject: Re: [CR]Crank length, today and yesterday
Date: Thu, 20 Sep 2001 17:54:42 -0500


Cool topic, Garth!

I'm kinda partial to my Sugino Mighty Competition and Super Mighty cranks: they've got 171mm arms, and I suspect that a lot of Japanese bikes were fitted with them during the 1970s.

I'm guessing that bike companies started thinking ergonmoically--and started using mid-length crank arms for the medium frames--sometime in the mid- or late-80s; didn't Shimano's Biopace stuff come out in the late 80s? If you need a larger frame, you probably have a longer femur, so the 175s would be fine (at least I'm thinking that femur length is the relevant measurement here as it relates to leverage and such); but folks who buy in-between frame sizes would probably benefit from the 172.5s.

There's got to be a rationale for the longer crank arm lengths (180mm) on mountain bikes, but I don't know what it is.

It'll be fun to see what insights knowlegable folks have regarding crankarms. . . .

nath 171 dresser