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Thread: BB help

  1. #1
    Senior Member nepaMTBer's Avatar
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    On my second bike I need to replace the BB, but I have no idea what size type ect. i need. Ive tried getting it from the trek website but its not working. Its a 2004 trek 4900. Does anyone know?
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  2. #2
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    should probably ask the shop you got the bike from either that or take off the bb and take to shop for a replacement of the same size. if you're asking to try to buy a bb from the net, i think you can just measure it. should be 63mm or 72mm if i'm not mistaken those are the common sizes..
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  3. #3
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    Quote Originally Posted by nepaMTBer
    On my second bike I need to replace the BB, but I have no idea what size type ect. i need. Ive tried getting it from the trek website but its not working. Its a 2004 trek 4900. Does anyone know?
    You have the Bontrager sport crankset. You need a 113 mm square taper BB. Measure your bottom bracket shell with a simple metric ruler to tell the length. I think i have the same frame on my 4300 and it is 73 mm.

  4. #4
    NCAA - DUAL CHAMPIONS! a2psyklnut's Avatar
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    You'll need a couple of special tools too (if you don't already know, if you do then stop reading now)

    An 8mm allen wrench
    A crank puller
    A bottom bracket tool
    Some anti-sieze compound or a good lube.

    Remember the non-drive side is reverse thread, so the righty tighty only works on the righty bikey. (meaning drive side of the bike)

    Some people also will put a couple wraps of teflon tape, but I only use this if creaking is a problem. Usually the anti-sieze or grease eliminates any creaking in aluminum frame.

    L8R
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  5. #5
    Senior Member nepaMTBer's Avatar
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    Thanks for the help.
    Im the king of scrabble
    There is none higher
    Got 11 points with the word quagmire

    http://www.stickergiant.com/Merchant2/imgs/g246.gif

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