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Buell Forum » 1125R Superbike Board » Archives 001 » Archive through June 17, 2010 » 1/8 in. movement in front break rotor? « Previous Next »

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1125rcya
Posted on Sunday, June 13, 2010 - 03:40 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Should I be able to push the front rotor into the rim with fingers or should the rotor be firmly mounted against the rim?
I just got through wiping my bike down and inspecting it before a ride. The rotor moves in 1/8 in.
Thanks
Mike
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Gemini
Posted on Sunday, June 13, 2010 - 03:46 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

yes. it is a floating rotor. a light "buzzing" noise when riding can also be normal
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1125rcya
Posted on Sunday, June 13, 2010 - 03:47 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Gemini,
Thanks!
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Petebueller
Posted on Monday, June 14, 2010 - 01:06 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

1/8 of an inch seems a lot. I've got about 1/32 on my Firebolt and a little more on the 1125
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Jdugger
Posted on Monday, June 14, 2010 - 07:46 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Keep an eye on those drive bushings -- they wear, too.
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Gemini
Posted on Monday, June 14, 2010 - 08:39 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

the only thing that is going to dictate how much movement the rotor has towards and away from the wheel is the bolt. on an actual measurment, i have .023 inch or .56mm of movment. that is starting with the rotor against the head of the bolt and pushing it to the rim. worn bushings will not increase this.
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Jdugger
Posted on Monday, June 14, 2010 - 09:21 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Correct, but since the rotor floats and the bushings aren't tall enough, the rotor will tend to dig into the bushings and prematurely wear them with the OEM rotor mount setup.

If your rotor is shiny silver, might not be much of a big deal, but if you are turning your rotor colors, keep an eye on 'em.
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1_mike
Posted on Monday, June 14, 2010 - 03:18 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

In the front...."what"...rotor ?

Mike
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