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Old 04-30-06, 08:22 PM   #1
nikos
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Putting my Bonti race wheels (9spd) on bros 7spd Trek?

So my brother has a half way decent road bike, Trek 2500 - it was the carbon with aluminum lugs bike, late 80's. The only thing is that it has some tank wheels with a 7 speed setup. I have a decent set of Bontrager wheels sitting around that has a 9 spd cassette. The rear wheel fits in his frame, I was surprised. So my question is this: can I swap the wheels, give him the lighter Bonti wheels, and figure out how to make the gearing work? Can we go with the 9 speed cassette and not use two of the gears? Or do we need to upgrade the front/rear derailers for 9spd setup? Thanks,.
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Old 04-30-06, 08:25 PM   #2
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Get a 7 speed cassette and a 4.5 mm spacer and use the existing components with the Bonti wheels.
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Old 04-30-06, 09:03 PM   #3
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So what's preventing the Trek from utlizing all 9 gears? Shifters i'm guessing?
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Old 04-30-06, 09:11 PM   #4
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So what's preventing the Trek from utlizing all 9 gears? Shifters i'm guessing?
and the chain.

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Old 04-30-06, 09:15 PM   #5
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If they're friction shifters, get a 9-speed chain and you should be fine. Otherwise, demoncyclist has the right idea.
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