Results 1 to 12 of 12
  1. #1
    mtbr member
    Reputation: FACTION95's Avatar
    Join Date
    Jun 2010
    Posts
    62

    Hope Brand new Rotor not true?

    I just bought a brand new set of Elixir CRs. The rear rotor is 160mm and the front is the 185mm kit. The rear is true but the larger front rotor isn't true. It rubs the left pad a bit when I spin the wheel. I did not use a torque wrench when I installed the rotor on my front wheel. Can a rotor become untrue when installed on a wheel if not torqued properly? Or is it possible to have an untrue rotor right out of the box? Could it be imperfections in the wheel that are throwing the rotor off?

  2. #2
    mtbr member
    Reputation: qbert2000's Avatar
    Join Date
    Jul 2008
    Posts
    3,225
    could easily be out of true. not a big deal just bend it back

  3. #3
    mtbr member
    Reputation: jkirkpatri's Avatar
    Join Date
    Sep 2008
    Posts
    1,230
    Lay the rotor on a flat surface. You'll see if it's the rotor or not. It's probably the rotor - just bend it back like qbert said.

  4. #4
    mtbr member
    Reputation:
    Join Date
    Dec 2009
    Posts
    384
    A good tool for correcting an untrue rotor is a crescent wrench. Make minor corrections using your brake pad as a trueing guide. Spin and note the regions out of true. Use the crescent wrench to bend the non-true sections gently back into true. Go slow. Enjoy rub free braking.

  5. #5
    mtbr member
    Reputation: FACTION95's Avatar
    Join Date
    Jun 2010
    Posts
    62
    Awesome! thanks for the info!

  6. #6
    mtbr member
    Reputation: FACTION95's Avatar
    Join Date
    Jun 2010
    Posts
    62
    One more question.

    Can I true the rotor with the crescent wrench while the wheel and rotor are on the bike?

  7. #7
    Never trust a fart
    Reputation: frdfandc's Avatar
    Join Date
    Sep 2007
    Posts
    3,885
    Yes, use the caliper as a reference. If it rubs on one side, bend it the other way and vice versa.

  8. #8
    mtbr member
    Reputation: FACTION95's Avatar
    Join Date
    Jun 2010
    Posts
    62
    Thanks again for the info people. My rotors are in great shape now

  9. #9
    mtbr member
    Reputation:
    Join Date
    Jan 2009
    Posts
    473
    for future reference: most new rotors will be slightly out of true straight out of the box. often they are not significantly out of true, but out of true none-the-less.

  10. #10
    mtbr member
    Reputation: vk45de's Avatar
    Join Date
    Feb 2009
    Posts
    1,084
    DAMMIT I am too late. STOP. It might not be your rotor, the mount surface can cause your rotor to wobble as well. Clean it or rotate rotor position on hub first before breaking out the wrench.

  11. #11
    How much does it weigh?
    Reputation: Borgschulze's Avatar
    Join Date
    Nov 2007
    Posts
    1,156
    How many people have a tool to face their ISO mount on their hubs?

    I've worked in 2 shops and neither have that tool, but they had seattube reams and BB taps/facers.

  12. #12
    mtbr member
    Reputation: vk45de's Avatar
    Join Date
    Feb 2009
    Posts
    1,084
    Quote Originally Posted by Borgschulze
    How many people have a tool to face their ISO mount on their hubs?
    You think I assume people have these things? What kind of idiot you take me for? I said CLEAN or rotate rotor position. The objective was to do as little as possible.

    Read it twice before making assumptions please. If you did and still came up with that, I'm sorry.

Posting Permissions

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