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Old RSX work with 8-speed cassette?(5 posts)

Old RSX work with 8-speed cassette?mtnpat
Nov 19, 2003 7:12 AM
I am giving some love to a friends old road bike, and have a question:

The bike is 6 yrs old, has RSX shifters that I believe are 7-speed. The bike also has a newer wheel and an 8-speed cassette....also has a brand new Ultegra derailluer.

The shifting in the back is real ugly....is this because the shifters are meant for a 7-speed cassette, with wider spacing between cogs?

If yes, does anyone still sell 7-speed cassettes?

thanks
re: Old RSX work with 8-speed cassette?Rusty Coggs
Nov 19, 2003 8:37 AM
Rsx shifters were available in 7 and 8 speed. 7 speed were silver/blue, I think, with part # STA410 and 8 were silvery gray part #sta416.Helps to know what you have. 7 and 8 speed shimano cog spacing is different,but close enough that mixing shifters and cassettes often works,but setup may be critical. There are lots of other things than can make shifting ugly. 7 speed cassettes are still around,but using them on an 8 speed hub requires a 4.5mm spacer on the hub before the cassette.
re: Old RSX work with 8-speed cassette?laffeaux
Nov 19, 2003 9:54 AM
I had 7-speed RSX and tried to make it shift with an 8-speed cassette (I'd heard it was possible), but I was never successful in making it work. I could get it to shift fine if you always upshifted or downshifted, but if you changed directions mid-cassette, it did not handle it well.

Check eBay for a 7-speed cassette.
re: Old RSX work with 8-speed cassette, or 9-speed?Chen2
Nov 19, 2003 11:36 AM
I don't know how much you want to spend but if the hub now has an 8-speed cassette you should be able to convert to 9-speed with new 9-speed shifters, cassette, and chain. The existing derailleurs will handle 9-speed. The old 7-speed RSX shifters may not last long anyway.
~Al
HmmFez
Nov 20, 2003 8:32 AM
Performance bike has plenty of Shimano 7 and 8 speed cassettes and chain.

Try those first. Those are cheap.

Not sure if your brand new derailleur could also be the problem.