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Ski during the off-season
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487 Posts
Discussion Starter · #1 ·
I have a friend with a mid-90's Trek 8xx bike that has grip shifters. He broke his RD this weekend and needs a replacement. I know that there is little to no difference between an 8 and 9 speed RD. What about a 7-spd RD? My understanding is that the hubs are smaller on 7-spd's but I did not know if that would affect the RD. Also, given the age of the bike, would he notice any difference between any of the lower-end SRAM RD's? Thx.
 

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Mantis, Paramount, Campy
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4,734 Posts
Any R Derailleur Will Work Fine

If going SRAM just make sure you use a 2:1 derailleur that'll work with non-Sram shifters.

OT: And wow, that 7spd rear hub spacing thing has got to be one of the biggest myths in the MTB world.
 

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I Love my Rize
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830 Posts
The hubs are smaller

Shayne said:
If going SRAM just make sure you use a 2:1 derailleur that'll work with non-Sram shifters.

OT: And wow, that 7spd rear hub spacing thing has got to be one of the biggest myths in the MTB world.
The hubs are shorter for the 7 speed freehub but the cassette spacing is the same as a 8 speed. The 8 or 9 speed cassette will not fit on a 7 speed freehub :nonod: but a 7 speed cassette will fit with the proper spacers on a 8 or 9 speed freehub. :yesnod:
 
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