Originally Posted by oldacura
We have a 1998 (I think) Co-Motion Co-Pilot with an 8 speed cassette & Ultegra derailllers. I recently replaced the rear 11/30 cassette with an 11/32.
You need to find an older XT or XTR rear derailleur: both have had a max sprocket size of 34t for many years now. In the current '07 line, the XT actually has a slightly larger capacity than the XTR.
As noted my MerlinXL, Ultegra have (and as best as I recall always have had) a max sprocket size of 27. While you can usually "cheat" a bit, you'll eventually hit the true max. I use a Campy long cage RD on our tandems and while it has a max sprocket size of 29, I've been able to "cheat" up to a 32t.... albeit with the index wheel kissing the 32t sprocket's teeth a bit.
Hypothetially using a longer B screw will just make the shifting lower on the cassette sloppy.
Last edited by TandemGeek; 07-13-07 at 07:02 AM.