Any JIS spindle won't let Campy or other ISO cranks go on quite all the way and will thus add 2-3mm effective length to each end of the spindle.
All the JIS spindles are 12.9mm "thick" (measured across flats, 3mm from the end), while European ISO crank spindles generally measure 12.65 to 12.75, depending on brand and vintage. New vs. old Campy are all pretty close btw, from 12.7 to 12.75mm.
David Snyder Auburn, CA usa
Greg Parker wrote:
> Are you saying that a current-production JIS Phil Wood BB won't work with
> any vintage Campagnolo crank, for example? I don't 'get' it.
> -------------- Original message --------------
> From: Mark Stonich <firstname.lastname@example.org>
>> At 2/25/2008 04:01 AM +0000, email@example.com wrote:
>> >I think there is (still) an awful lot of confusion out there
>> >regarding Campagnolo BBs. Prior to 1993, Campagnolo used JIS-tapered
>> >spindles, just like virtually everyone else did
>> A few minutes with an assortment of modern JIS and old Campi cranks
>> and spindles will show you that if the older Campis weren't ISO they
>> sure as heck weren't JIS either. What may be confusing you is that
>> some of the better old Japanese cranks, like Sugino Mighty, were
>> Campi compatible instead of JIS. Come to think of it the Sugino 75
>> Track crank still is.
>> Mark Stonich;
>> BikeSmith Design & Fabrication