Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
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7-speed and 8-speed cassette spacing is a "hair" off. Some people claim to have mixed and matched 7-speed and 8-speed parts with satisfactory results but I've personally never been pleased when I've tried it.
Bottom line, I might give it a try if I already owned all of the respective components but, if I were buying components, I'd hold out for matching parts.