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  1. #1
    Senior Member rallen's Avatar
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    when the rear wheel spins the cluster wobbles

    Haven't done alot of investigating yet but i'm working on fixing up an old Trek 1200 and when the rear wheel spins as if the bike were coasting the cluster wobbles. Any tips?

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    Senior Member Ophidian's Avatar
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    I don't know if you have a freewheel or freehub, freehub is when ou can slide the cogs on the freehub body. Most freewheel type cogs do this because you need some play in the freewheel or else it won't work. Even new ones do this. Now as parts wear out there will be more movement. If you think it's too much it wouldn't hurt to replace your chain and cogs. Freehubs do this alot less than freewheels. If you have a freehub and lots of movement than it's time for a new freehub.

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    Quote Originally Posted by rallen
    Haven't done alot of investigating yet but i'm working on fixing up an old Trek 1200 and when the rear wheel spins as if the bike were coasting the cluster wobbles. Any tips?
    Could be a loose cassette.

    Could be a bent axle.

    Both are cheap fixes.

    Bob

  4. #4
    Isaias NoRacer's Avatar
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    Quote Originally Posted by rallen
    Haven't done alot of investigating yet but i'm working on fixing up an old Trek 1200 and when the rear wheel spins as if the bike were coasting the cluster wobbles. Any tips?
    You didn't state whether you just replaced the cassette and whether it's Shimano or Campy.

    Just from what you said and the possibilities already stated, you can add a vote for missing spacers if it's a freehub.
    2009 mileage = 14,738 miles; 2010 mileage = 15,234 miles; 2011 mileage = 17,344 miles; 2012 mileage = 11,414 miles; 2013 = 12,169

  5. #5
    Senior Member rallen's Avatar
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    It is a free wheel I believe. It is Shimano 105, the chainstay guard says "New Shimano 105" (I get a kick out of that) It is a 7 speed. The play is probably about 3 to 4 mm.

    No parts have been replaced... yet.

    I do not think I even have the proper tools for working on a free wheel...

    Thanks

  6. #6
    Unique Vintage Steel cuda2k's Avatar
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    3-4mm is a bit excessive even for a freewheel in my (disclaimer: limited) experience. Though, as others have stated, all do have some wobble in them. I actually started pretty much the same thread a while back when I first discovered this behavior. New Shimano freewheels are pretty cheap, bikepartsusa.com has about the best price I've seen, or ebay is always a good option as well. You'll need a freewheel remover and a good large wrench to get the old one off. Or a freewheel remover and a vise is an even better option (put remover in vise, put wheel over remover, rotate wheel).

    With as much play as you are describing, it could be a bent/broken axle. Either way, the freewheel will need to come off.

  7. #7
    Senior Member Matt Gaunt's Avatar
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    It's called 'dancing' and it's quite common, even up to 3mm. It sort of depends on what the relationship is between the hub and the freewheel unit. It could be what the guys are saying - bent axle etc. - but to be honest if it works fine then I would leave it be.
    Matt
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  8. #8
    Sometimes knows stuff. rmfnla's Avatar
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    Quote Originally Posted by Matt Gaunt
    It's called 'dancing' and it's quite common, even up to 3mm. It sort of depends on what the relationship is between the hub and the freewheel unit. It could be what the guys are saying - bent axle etc. - but to be honest if it works fine then I would leave it be.

    Hardly.

    Freewheels wobble is from the gap that is usually present in loose ball bearing systems. Most freewheels have lots of tiny balls in two runs. The spacing in the balls changes constantly as the unit turns, creating the wobble effect.

    It's normal; watch the road instead.
    Today, I believe my jurisdiction ends here...

  9. #9
    Senior Member DieselDan's Avatar
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    Quite common. In fact, if it doesn't wobble a bit, it won't freewheel.
    Bikes use brakes to stop.

    If your bike has breaks, don't ride it.

  10. #10
    Senior Member vw addict's Avatar
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    OMG!!!!!!! Get a new bike!!!!!!!! It's possesed!!!!!!!!

  11. #11
    Senior Member Matt Gaunt's Avatar
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    Quote Originally Posted by rmfnla
    Hardly.

    Freewheels wobble is from the gap that is usually present in loose ball bearing systems. Most freewheels have lots of tiny balls in two runs. The spacing in the balls changes constantly as the unit turns, creating the wobble effect.

    It's normal; watch the road instead.
    Wow, you learn something every day! I was under the impression that it was because of the fit of the freewheel unit. Cheers for that, I apologise for misleading any folk.
    Matt
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