Bicycle Mechanics - 9 Speed Derailleur on 7 speed cassette?

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elunty
06-05-10, 10:20 PM
Sorry if this has been asked a million times before, but can i use a 9 speed r/d on a 7 speed cassette? Will my normal ezfire 7 speed shifters work with this set-up

cassette: Shimano TZ 7
new derailleur: http://www.jensonusa.com/store/product/RD604A01-Shimano+Lx+Rd-M580+Rear+Derailleur.aspx or http://www.jensonusa.com/store/sub/1565-Derailleurs+Rear.aspx , anything of that sort.

dcullen
06-06-10, 05:55 AM
Works 100%
Retro Grouch
06-06-10, 06:10 AM
As long as you stick with a Shimano derailleur you'll be OK.

Rear derailleurs guide the chain by the center of the link so they are unaffected by chain width.

akansaskid
06-06-10, 09:39 PM
The only other issue that comes to mind is chain width. For sure a Tiagra RD won't work with an old 5-speed chain - chain hangs in the brackets holding the pulleys as it's too wide. I think I read somewhere, though, that a 7-speed chain is narrow enough not to be a problem.