I agree with John, because one of the major issues is whether the cage hits the large cog when trying to slide under it. Moving the wheel back both increasese the distance from wheel center to cage pivot center, and increases cage rotation, moving the jockey wheel away from the cog. The big question still is whether enough rotation exists to rotate "out" to manage this clearance, and to rotate "in" to take up chain slack in the little-little position.
Ken Freeman Ann Arbor, MI USA
-----Original Message----- From: classicrendezvous-bounces@bikelist.org [mailto:classicrendezvous-bounces@bikelist.org] On Behalf Of John Thompson Sent: Friday, February 23, 2007 6:11 PM To: classicrendezvous@bikelist.org Subject: Re: [CR]28 teeth with Campagnolo Nuovo Record?
Kurt Sperry wrote:
> That would seem to jibe with the empirical observation that it is
> sometimes optimal or even necessary to slide the axle back in the DO
> slots to make a
> 28 work. What is that if not increasing the effective chainstay length?
It's also changing the location of the rear derailleur with respect to the rear axle, which may be more significant than the changer in chainstay length.
--
John Thompson (john@os2.dhs.org)
Appleton WI USA