Dura-Ace 7700 & 7800 9-10speed compatability

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 ?

thanks

Rick

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 ?

thanks

Rick


7800 rear shifters: 10 speed
7700 rear shifters: 9 speed
7700/7800 front shifters: both 9 and 10 speed

7800 rear der: 9/10 speed
7700 rear der: 9 speed (maybe also 10? don't know)

7800 front der: 10 speed
7700 front der: 9/10 speed

7700/7800 cranks/chainrings: both 9 and 10 speed

7800 chain: 10 speed
7700 chain: 9 speed

7800 cassette: 10 speed
7700 cassette: 9 speed

Someone please correct me if I'm wrong!

Francesco

"Francesco Devittori" frenkatfrenkdtcm wrote in message
...
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
?

thanks

Rick


7800 rear shifters: 10 speed
7700 rear shifters: 9 speed
7700/7800 front shifters: both 9 and 10 speed

7800 rear der: 9/10 speed
7700 rear der: 9 speed (maybe also 10? don't know)

7800 front der: 10 speed
7700 front der: 9/10 speed

7700/7800 cranks/chainrings: both 9 and 10 speed

7800 chain: 10 speed
7700 chain: 9 speed

7800 cassette: 10 speed
7700 cassette: 9 speed

Don't forget DA 7700 rear hub will fit 8, 9 or 10 cassette;

DA 7800 rear hub will ONLY FIT 10 cassette!

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 ?

thanks

Rick


This took me all of 15 seconds ...

http://tinyurl.com/cuhgg

Click on the appropriate pdf link.


Robin Hubert

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 ?
thanks
Rick

This took me all of 15 seconds ...
http://tinyurl.com/cuhgg
Click on the appropriate pdf link.
Robin Hubert

Except that Shimano isn't always forthcoming about compatibility. They
will sometimes declare combinations as incompatible when they are
compatible, for marketing / sales / profit motives. Don't get me wrong,
Shimano is usually the most bang for buck, but sometimes they won't
admit to the maximum bang.

The best reference I know of for this sort of info is Sheldon @
www.sheldonbrown.com

Hope this helps, John

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 ?

john wrote:

The best reference I know of for this sort of info is Sheldon @
www.sheldonbrown.com

Thanckx for the plug. A direct link is:

http://sheldonbrown.com/dura-ace

(You never need the "www." part on any of my sites.)

Sheldon "Compatibility" Brown
+----------------------------------------------------------+
| The more simple any thing is, the less liable it is to |
| be disordered, and the easier repaired when disordered. |
| -- Thomas Paine, Common Sense |
+----------------------------------------------------------+
Harris Cyclery, West Newton, Massachusetts
Phone 617-244-9772 FAX 617-244-1041
http://harriscyclery.com
Hard-to-find parts shipped Worldwide
http://captainbike.com http://sheldonbrown.com

Francesco Devittori wrote:
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 ?

thanks

Rick


7800 rear shifters: 10 speed
7700 rear shifters: 9 speed
7700/7800 front shifters: both 9 and 10 speed

7800 rear der: 9/10 speed
7700 rear der: 9 speed (maybe also 10? don't know)

7800 front der: 10 speed
7700 front der: 9/10 speed

7700/7800 cranks/chainrings: both 9 and 10 speed

7800 chain: 10 speed
7700 chain: 9 speed

7800 cassette: 10 speed
7700 cassette: 9 speed

Someone please correct me if I'm wrong!

Francesco

OK-7700 and 7800 stuff is cross compatible EXCEPT front ders, which are
not...they can be made to work but 7800 fronts and 7700 STI, and vice
versa, are not ideal.

Qui si parla Campagnolo wrote:


OK-7700 and 7800 stuff is cross compatible EXCEPT front ders, which are
not...they can be made to work but 7800 fronts and 7700 STI, and vice
versa, are not ideal.
And the 7800 hubs are 10S only if I understood this well.

Greets, Derk

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.

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...

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