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  1. #1
    Senior Member
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    Dec 2005
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    Pedal Force RS, Serotta "Atlanta", Gitane "Tour de France", (2) Specialized "Stumpjumper", Trek "950"
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    Bottom Bracket Grinding

    Hi,
    I have a sealed cartridge shimano bottom bracket that feels like it's grinding when mounted on the bike. If I remove the cartridge it spins normally. It starts to grind when I torque down the removable ring.

    I followed the procedure found at the Park website:
    http://www.parktool.com/repair/readhowto.asp?id=94

    The less I tighten the better it feels; however, if I leave it loose enough to eliminate the grinding then it is not torqued properly.

    For context, I am refurbishing an old, Speacialized Stumpjumper rigid frame (1992-ish). So I kind of expect to find worn parts.

    What is going on here? Is my cartridge worn out?

    Thanks!

  2. #2
    Senior Member
    Join Date
    Aug 2005
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    Pittsburgh, PA
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    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
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    It's likely your bottom bracket shell faces aren't exactly parallel and when you tighten down the non-drive side cup, it warps the cartridge enough to bind slightly. Either have the bb shell faced or don't tighten down the nds cup too much. All that cup has to do is locate the cartridge so it needen't be torqued as much as the drive side.

  3. #3
    Senior Member
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    Interesting, this makes me think that the shop didn't install it correctly. I see no evidence that it was faced. I would expect to see some paint removed in the facing area.

    Thanks for the response, BTW.

  4. #4
    Banned.
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    Apr 2010
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    Chicago IL
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    Is the non drive side cup plastic?

    Did they use the right length bb? Chances are this is not the problem

  5. #5
    Senior Member
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    Dec 2005
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    Pedal Force RS, Serotta "Atlanta", Gitane "Tour de France", (2) Specialized "Stumpjumper", Trek "950"
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    Quote Originally Posted by gt35built View Post
    Is the non drive side cup plastic?

    Did they use the right length bb? Chances are this is not the problem
    Not plastic. I don't know for sure the correct length BB was used, but I've been riding it with for years and I suspect it has always been this way.

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