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  1. #1
    Singletrackmac
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    Need help with (old) BB7 front brake pulsing

    My old front BB7's are pulsing, but only when I brake hard. I am thinking I need a new rotor, but am not sure if it could be the pads or a set up issue that is causing the pulsing.

    Is the old rotor most likely the cause?

    If so, what modern day rotor would you suggest I get to replace this one so that it will be compatible with my old BB7 calipers? The front is a 185mm and the back is 160mm.

    Thanks for any help. Nice to know more before I start ordering parts.

    Need help with (old) BB7 front brake pulsing-bb7.jpg
    Last edited by singletrackmack; 06-25-2013 at 01:50 PM.
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  2. #2
    Trail Tire TV on blogger
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    it's probably just warped.. straighten out the rotor and it'll be fine.. new pads and a light sanding of the rotor will help also.

    another thing is if you have cup and cone bearings (mostly shimano) if they are worn or too loose they will cause a wobble under braking,,,
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  3. #3
    Nouveau Retrogrouch SuperModerator
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    Need help with (old) BB7 front brake pulsing

    Quote Originally Posted by singletrackmack View Post
    My old front BB7's are pulsing, but only when I brake hard. I am thinking I need a new rotor, but am not sure if it could be the pads or a set up issue that is causing the pulsing.

    Is the old rotor most likely the cause?

    If so, what modern day rotor would you suggest I get to replace this one so that it will be compatible with my old BB7 calipers? The front is a 185mm and the back is 160mm.

    Thanks for any help. Nice to know more before I start ordering parts.

    Click image for larger version. 

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    Avid use to have problems with uneven rotor thickness which caused pulsing. Have not seen it in years, though.

    Any 6-bolt rotor of the proper diameter works, as long as the braking track is wide enough.
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  4. #4
    Singletrackmac
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    Quote Originally Posted by thomllama View Post
    another thing is if you have cup and cone bearings (mostly shimano) if they are worn or too loose they will cause a wobble under braking,,,
    Are you referring to the wheel hub bearings causing the pulsing? If so the hubs are Easton's. Not sure if they have cup and cone bearings.
    Get out of the gutter and onto the mountain top.

    "I only had like two winekills captain buzzcooler"

  5. #5
    Singletrackmac
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    Quote Originally Posted by thomllama View Post
    it's probably just warped.. straighten out the rotor and it'll be fine.. new pads and a light sanding of the rotor will help also.
    I checked for the rotors to see if they are warped and they look to be very straight.

    I also lightly sanded them before my after noon ride. I sanded the top dirty layer off just to the point were they were shinny again, but I still had the pulsing issue during my ride.

    I found these in another post regarding changing out the old BB7 Rotors.

    Alligator Round Rotor | Alligator | Brand | www.PricePoint.com

    They are not expensive, so I might be trying these and some new pads if I can't get it figured out.
    Get out of the gutter and onto the mountain top.

    "I only had like two winekills captain buzzcooler"

  6. #6
    Singletrackmac
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    I just realized that these rotors come in a 180mm, but I have a 185mm.

    Can I use a 180mm?

    If I can will I need to adjust the calipers?

    Alligator Round Rotor | Alligator | Brand | www.PricePoint.com
    Get out of the gutter and onto the mountain top.

    "I only had like two winekills captain buzzcooler"

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