Dura-Ace 7700 & 7800 9-10speed compatability

Phil, Squid-in-Training wrote:
Paul Kopit wrote:
On Sat, 28 Jan 2006 13:26:42 -0600, (rs)
wrote:

How does this work, 7800 is for 10 speed and won't work for 9 speed
cassettes? 7700 will or will not work with 10 speed cassettes?
Please, what's the downward/upward compatibility of Dura-Ace 7700 &
7800 ?

If you used Campy Ergo 10 with a Campy rear derailleur, you could
shift Shimano 9/10 and Campy 10.

I forget... does Shim10 work straight, no mods, with Campy 10? The spacing
is going to be 2mm off at the extremes..

Yes it does and it isn't 2mm 'off' at the extremes.
..

I'm glad that American Classic Campy Conversion cassettes are as cheap as
Ultegra 10 cassettes. Yay for cheap Shimano hubs!
--
Phil, Squid-in-Training

The difference is .17mm per cog (4.12mm Campag. vs. 3.95mm
Shimano).This results in an accumulated error of 1.53mm over the
course of 9 shifts, which is closer than the 9sp difference of 0.23mm
(1.84mm cumulative). It'll work just fine.



Robin Hubert

On Mon, 30 Jan 2006 00:03:12 -0500, "Phil, Squid-in-Training"
wrote:

I forget... does Shim10 work straight, no mods, with Campy 10? The spacing
is going to be 2mm off at the extremes...

It really works. If you set the system to shift Shimano 10, just
increase the cable tension by ~1½ turns and put in the Campy cassette.
In some bikes, you don't even have to adjust the cable stops.

Should you want actual perfection, you get a pre 2001 Campy rear
derailleur and that shifts exactly Shimano spacing.