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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 07-29-09, 12:17 PM   #1
cwf340
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need new crankset trek y3.

I have an old trek Y3. It still has all the stock drive train on it and I want/need to upgrade the bottom bracket and crankset. I want to use outboard bearings. It is an 8 speed. Can I use a 9 speed crankset with my 8 speed chain? Will the derailluer change gears normally?
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Old 07-29-09, 02:21 PM   #2
sch
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Outboard bearings should be no problem. 8spd chain compatibility with 9spd CW is very good,
the cassette slightly less so but acceptable. Der should also function normally. Main ? is how
much chain wear there is. If chain wear is more than 1/16", get a new 9spd chain, $20-25
well spent.
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Old 07-29-09, 02:34 PM   #3
cwf340
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thank you, I ordered a 9 speed chain with the crankset.
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Old 07-29-09, 04:41 PM   #4
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You will likely need to adjust the rear-derailleur for the change, but that's easy. I hope you have the proper tools to do the installation - or can borrow same. And you'll be needing a torque-wrench.
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