Join Date: Jun 2005
Bikes: 06 Lemond Reno, 98 GT Timberline mtn.bike
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"Rough" drivetrain diagnosis needed.......
I have a 1998 GT Timberline frame (chromo) that I like. Had a 7-spd drivetrain, decided to chg to 8.
Put on XTR 12-32 cassette on an LX hub, Mavic rims, Alivio der., new 8 spd rear shifter, SRAM PC-58 chain. Shifts fine, but is rough when in 8th (smallest cog) and 2nd or 3rd front gear (larger cogs). The 7 and 8-spd hub seem to be same width. The only thing I've noticed is if I turn the cranks backwards, there is a sound which sounds like it comes from the freehub, like rough bearings, kind of a pop-pop. If I take tension of of the rear der.arm, so not much chain tension on the cassette, does not seem to do it. With the wheel off, the freehub seems smooth enough, but other than the freehub bearings needing lube, I can't think of what it could be. Anyone?