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  1. #1
    Patrick Barber weed eater's Avatar
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    rear wheel rubs slightly when under pressure

    hi all, wondering if you might have any experience with this...

    lately I notice when I apply hard backpressure while slowing, or hard forward-pressure while accelerating, my rear tire rubs against the fender or the rear brake pad. It happened just now and I presumed it was moving in the dropouts, but then I got home and checked the axle nuts and they were tight.

    I am running a pretty low gear (~60") which means I can apply a lot of force in both directions. Trek conversion with horizontal dropouts, and, alas, no chain tensioner.

    whaddya think? Frame flex? Wheel flex? (!!?) Or it slips in the dropouts even though it's tight?

    Has this ever happened to you?

    Thanks

    Patrick

  2. #2
    pompous windbag Smorgasgeorge's Avatar
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    I had a problem with the back wheel on my old conversion and realized that the brazing on the seat stay had cracked. I don't know if this could be your problem, but it's worth a look.

  3. #3
    live free or die trying humancongereel's Avatar
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    i had this problem with an old road bike that didn't have a QR rear wheel. i hadn't tightened the bolts properly and the force of the chain was pulling the wheel forward on the right side, so that it rubbed on the left fork.

    does that make sense? i think i said it how i wanted to...i think i'm getting sick again...

  4. #4
    Patrick Barber weed eater's Avatar
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    makes sense. maybe i just need to tighten down the bolts more. and use a tensioner.

  5. #5
    Senior Member
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    I had exact problem on a mountain bike and I had broke the axle

  6. #6
    live free or die trying humancongereel's Avatar
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    yeah, i've had that, too. but check the little things first, then work your way up.

    oh, and i don't think you need a chain tensioner. i think very few people on here use them.

  7. #7
    Patrick Barber weed eater's Avatar
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    i poked around...frame and axle are solid. seems to be frame flex, exacerbated by the fact that I could use another link in my chain (ha ha) to keep the wheel a little back from the fender. Plus I just gotta cool out on the mega torque! Dude! Mel-low.

  8. #8
    live free or die trying humancongereel's Avatar
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    torque demon.

  9. #9
    Electrical Hazard
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    could be loose bearing cones, causing a slight amount of hub play as well.

  10. #10
    redonkulous Rikardi151's Avatar
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    Can you get chain tensioners for horizontal dropouts?(not fork ends)

  11. #11
    jack of one or two trades Aeroplane's Avatar
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    Those spur ones they sell at Danscomp are pretty popular among conversions at the FGG.
    Quote Originally Posted by Dr Irwin Goldstein
    Men should never ride bicycles. Riding should be banned and outlawed. It is
    the most irrational form of exercise I could ever bring to discussion.

  12. #12
    Taking "s" outta "Fast" AfterThisNap's Avatar
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    In additon to what they said, I would check spoke tension, or more specifically, the evenness of tension around the wheel.

  13. #13
    asleep at the wheel fixedpip's Avatar
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    2nd the suggestion that you check for play in the hub and examine your rear wheel spoke tension. It could be frame flex but it would have to be a pretty weady frame to move that much.

    I'd also visual check for cracks etc if the frame if alu

  14. #14
    Lunigma
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    Quote Originally Posted by lyledriver
    could be loose bearing cones, causing a slight amount of hub play as well.
    i second that, if you say that the bolts are on tight it's probably the cones being too loose. i can't think of anything else, i don't think the spokes being under tensioned would be too much of a problem.

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