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Using 9speed STI shifters w/ 7 speed drive train .POSSIBLE??(5 posts)

Using 9speed STI shifters w/ 7 speed drive train .POSSIBLE??jamaicanboss
Aug 27, 2001 12:03 PM
Currently my friend runs a 7 speed Shimano Duraace derailuer w/ RSX brake levers / shifters and it works fine as a 7 speed system( I think they were 8 speed shifters ) , till accident and losing use of one lever. He bought a set of Ultegras 9 speed STI levers ( 6501) and wanted to know if it could be configured to work like previous set up ... 7 speed drivetrain. He will upgrade to a full 9 speed system ( derailer/chain cassette) later as funds allow , thus he didnt want to purchase another set of RSX levers and limit himself .
He is also using a 7 speed Duraace 12-21 freewheel and frame spacing is for 7 speed system ( older Vitus frame circa 1995)
POSSIBLE is a relative term.Spoke Wrench
Aug 27, 2001 12:43 PM
It's definitely possible to cobble together mismatched parts and get it to "sort of" work. It will be noisy. It will sometimes take two shifts to move the chain one cog. There may be "phantom" shifts where the chain moves from cog to cog on its own. If your performance standards are low enough, it's possible.

It will not be possible to get that combination of parts to work to my standards.
re: Using 9speed STI shifters w/ 7 speed drive train .POSSIBLE??KStone
Aug 28, 2001 5:41 PM
you can use a 9spd cassette, 9spd shifters, 9spd chain on a 7 spd wheel(frame dropouts are narrow). Just remove 1 9spd cog from the stack and you'll end up with an '8 spd.' You may need a 9spd der. though.
re: Using 9speed STI shifters w/ 7 speed drive train .POSSIBLE??LC
Aug 28, 2001 7:10 PM
That is a interesting idea KStone, have you tried that yourself or is it just a theory?

The important thing to note is that a 9 speed shifter will not work on a 7 or 8 speed cogset.
re: Using 9speed STI shifters w/ 7 speed drive train .POSSIBLE??doldroyd
Aug 30, 2001 12:51 PM
I am looking to do something similar, and it looks like it is possible. Good explanation of how on Sheldon Brown's site

http://www.sheldonbrown.com/k7.html#up7