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8spd & 9spd RD's compatible??(6 posts)

8spd & 9spd RD's compatible??B2
Dec 2, 2002 8:29 AM
Can a Shimano 8 speed rear derailleur be used in conjuction with 9 speed shifters?

Thanks,
Bryan
re: 8spd & 9spd RD's compatible??Rusty Coggs
Dec 2, 2002 8:32 AM
All of them except the pre 9 speed DA.The pre 9 speed DA can be used with a Shimano 9 speed shifter, to shift a Shimano 8 speed cassette.
8 speed RD w/9 speed cassette and shifters?B2
Dec 2, 2002 1:52 PM
I guess I wasn't very clear about what I was trying to accomplish. I would like to use a Shimano XT 8 speed rear derailleur in conjunction with a 9 speed cassette and Ultegra STI 9 speed shifters.

I don't believe I would have any problem adjusting the stops (although I haven't tried). I was just wondering if the 8 speed derailleur moves the same distance as the 9 speed given the same amount of cable travel?

Thanks,
Bryan
8 speed RD w/9 speed cassette and shiftersChen2
Dec 2, 2002 2:50 PM
It should work because the spacing is a function of the shifters and cog spacing. The derailleur has no "stops" to adjust. I recently upgraded a friends bike with 9-speed shifters and cassette, the old "7-speed" derailleur worked with them flawlessly.
~Al
Thanks Much - I'll stick with plan A then (nm)B2
Dec 2, 2002 4:32 PM
perfectly clearRusty Coggs
Dec 2, 2002 5:02 PM
The answer was yes.EXCEPT, don't try using a pre 9 speed DA.the throw ratio of that derailer is different than the others.