Advertise on Bikeforums.net



User Tag List

Results 1 to 5 of 5
  1. #1
    Junior Member
    Join Date
    Jun 2008
    Posts
    18
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Avid disc brake truing: am I the only one with this problem?

    I recently bought a Avid bb7. The rotor that came with had +/- 0.030 runout, and even with the Park rotor truing tool I couldn't come close to truing it to a point where the caliper pads could be run all close together w/o rubbing the rotor. I then bought two Avid rotors from a local shop. Both out of round. The shop employee said it's the norm for (Avid?) rotors to be out of round out of the box and for truing to be frequently necessary, but Park says that it's usually better to simply chuck a non-tru rotor and buy a new one than to be take the trouble to tru.
    Am I the only one with this problem? I don't think I'm setting up the brake wrong. The instructions on the Park website seem pretty clear. And even if I'm setting up the brakes incorrectly, I can see with my wheel truing stand and a dial indicator that the rotor has signicant runout.

    Thanks.

  2. #2
    Mmmmm potatoes idcruiserman's Avatar
    Join Date
    Sep 2006
    Location
    Idaho
    Posts
    1,921
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The stock rotor sucks IMO. I've had lots of trouble with warped ones. Upgrade to the clean sweep.
    Idaho

  3. #3
    Upstanding member. Mike T.'s Avatar
    Join Date
    May 2005
    Location
    Ontario Canada
    My Bikes
    Argon18 road, Seven mtb, Marinoni track, Masi dirt road bike, Marinoni cyclocross.
    Posts
    446
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    In ten years of disc brake use I haven't owned a rotor yet (out of about 8 sets of brakes) that didn't need truing. It's no big deal and takes just a few minutes. I prefer the Morningstar tools for the job - there's 3 of the tools and they work great -

    http://www.morningstartools.com/drumstix.html

    But then I have no problems with using just an adjustable wrench too.

  4. #4
    Senior Member
    Join Date
    May 2004
    Location
    Wilmington, DE
    My Bikes
    2003 Specialized Hardrock, 2004 LOOK KG386i, 2005 Iron Horse Warrior Expert, 2009 Pedal Force CX1
    Posts
    8,849
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Have you confirmed that it's not your hub that's not flat? Are you torquing the rotor down evenly? I bought two BB7 brakes a while back and when I laid the rotors on top of each other, they were perfectly flat.

  5. #5
    Junior Member
    Join Date
    Jun 2008
    Posts
    18
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks for all your replies. I appreciate your input.
    --Yes , I checked if the hub might be out-of-round and I used a torques wrench on the rotor bolts.
    --I'll try the Morningstar tools.
    --I'll try the Clean Sweep rotor.

Posting Permissions

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