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  1. #1
    1,520,000 nikos's Avatar
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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,.

  2. #2
    Senior Member demoncyclist's Avatar
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    Get a 7 speed cassette and a 4.5 mm spacer and use the existing components with the Bonti wheels.
    DEMON

    Satanic Mechanic
    STAR 3 Spinning Instructor

    2011 Lynskey Sportive (Shimano Ultegra 10s)
    1988 Cannondale SM400 (Suntour XC-M 7s)

  3. #3
    cab horn
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    So what's preventing the Trek from utlizing all 9 gears? Shifters i'm guessing?

  4. #4
    Senior Member erader's Avatar
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    Quote Originally Posted by operator
    So what's preventing the Trek from utlizing all 9 gears? Shifters i'm guessing?
    and the chain.

    erader

  5. #5
    Sweetened with Splenda
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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.
    Falling down is not exercising.

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