Advertise on Bikeforums.net



User Tag List

Results 1 to 4 of 4
  1. #1
    Senior Member Shilun's Avatar
    Join Date
    Jun 2005
    Location
    Taiwan
    Posts
    142
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Flat spot on a front wheel.

    I've just picked up an old front racing wheel with a 700 x 23 tire. When I spin it, there is an obvious downward movement at one section of the wheel. It's not a side to side wobble, just downward. When I remove the tire and tube, the wheel spins fine, at least to my eye. However, when I replace the tube and tire and pump them up, I can clearly notice a flat section about 4 inches long, almost as if the tube is sitting too deep in the rim. Both the tire and tube are fairly new and seem to be in good condition. Similarly, the rim doesn't appear to have any obvious kinks in it. Can anyone help? I've never come across this kind of problem before.

    Thanks.

  2. #2
    Village Idiot
    Join Date
    Jan 2007
    Location
    Bahstaaaaan
    Posts
    19,946
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I have something like this on one of my wheels too, but there's a broken spoke where the wheel does this.
    Have you checked the spokes for loose or broken spokes?

  3. #3
    Senior Member
    Join Date
    Aug 2005
    Location
    Pittsburgh, PA
    My Bikes
    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
    Posts
    25,814
    Mentioned
    7 Post(s)
    Tagged
    0 Thread(s)
    Any chance the tire is uneven? Try a different tire and see if the problem remains.

  4. #4
    Senior Member Shilun's Avatar
    Join Date
    Jun 2005
    Location
    Taiwan
    Posts
    142
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks for your suggestions. I checked both the tire and spokes, but no obvious problems. Finally, I took out the inner tube again and this time noticed that the rim tape had ridden up slightly on one side of the rim. I'm guessing that the tire was flat and left standing for a prolonged period. As a result, the rim tape slowly crept up on one side. Anyway, I took a sharp knife to the tape and cut off the excess. Like magic, the flat spot has now disappeared. Thanks again for your suggestions.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •