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Thread: What's the reason for a bent back rotor?

  1. #1
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    4th June 2009 - 09:15
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    What's the reason for a bent back rotor?

    Didnt realise till it was pointed out-i have a bent back rotor!
    Just wondering what could have caused it?
    I've only had the bike a few months, so im only just getting to grips with the "must check before purchases". *duh*!!

  2. #2
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    29th October 2007 - 00:44
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    how about an emergency braking excersise ?
    Don't Ride Faster Than Your Guardian Angel Can Fly !!!



    Hey Alan, Alan, Alan....

  3. #3
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    Could be lots of reasons. Most common is overheating, and then cooling down when stopped. The caliper retains heat on that part of the disc, which sets up stresses in the metal, causing warpage.
    Could also have suffered a knock or something. Perhaps a hamfisted tyre change.
    Do you realise how many holes there could be if people would just take the time to take the dirt out of them?

  4. #4
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    Quote Originally Posted by MSTRS View Post
    . Perhaps a hamfisted tyre change.
    Most likely cause...
    The back rotor only has about 10% of the energy the front ones get put through them.....

    So, my guess is that the wheel has fallen to the floor while it was off the bike.
    OR, the rim was stood on while the tyre was levered off...
    Or, the rim went flying when it got popped out of the tyre....

    Rear disc rotors hardly ever wear out. I'm sure a good second hand one can be found easily....
    Last edited by quickbuck; 29th August 2009 at 23:39. Reason: more info

  5. #5
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    Quote Originally Posted by quickbuck View Post
    Most likely cause...
    The back rotor only has about 10% of the energy the front ones get put through them.....

    So, my guess is that the wheel has fallen to the floor while it was off the bike.
    OR, the rim was stood on while the tyre was levered off...
    Or, the rim went flying when it got popped out of the tyre....

    Rear disc rotors hardly ever wear out. I'm sure a good second hand one can be found easily....
    And they be cheap (compared to fronts)
    Do you realise how many holes there could be if people would just take the time to take the dirt out of them?

  6. #6
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    Quote Originally Posted by MSTRS View Post
    And they be cheap (compared to fronts)
    And you can make them out of aluminium apparently

    now I'm going to wait for the visitors to the pit garage at round 5...

    Disclaimer : DO NOT MAKE DISCS OUT OF ALUMINIUM FOR A ROAD BIKE!
    Last edited by quickbuck; 30th August 2009 at 11:46. Reason: DISCLAIMER

  7. #7
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    Quote Originally Posted by quickbuck View Post
    Disclaimer : DO NOT MAKE DISCS OUT OF ALUMINIUM FOR A ROAD BIKE!
    s/Disclaimer/WARNING/

    Steve
    "I am a licenced motorcycle instructor, I agree with dangerousbastard, no point in repeating what he said."
    "read what Steve says. He's right."
    "What Steve said pretty much summed it up."
    "I did axactly as you said and it worked...!!"
    "Wow, Great advise there DB."
    WTB: Hyosung bikes or going or not.

  8. #8
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    could possibly have had some numpty try to ride off with the disc lock still in it - that's usually pretty good at munting brake discs.
    KiwiBitcher
    where opinion holds more weight than fact.

    It's better to not pass and know that you could have than to pass and find out that you can't. Wait for the straight.

  9. #9
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    Quote Originally Posted by R6_kid View Post
    could possibly have had some numpty try to ride off with the disc lock still in it - that's usually pretty good at munting brake discs.
    Yup...
    Must have been a real munter to put the lock in the rear disc....
    But then there have been stranger things happen at sea.

  10. #10
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    Quote Originally Posted by DangerousBastard View Post
    s/Disclaimer/WARNING/

    Steve
    Well.... I hardly ever touch the thing personally... Just at car park speeds.

    front on the other hand.... Well, arguably too much!

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