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  1. #1
    Senior Member draxine's Avatar
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    shimano hollow tech II bottom bracket cups

    Hey all

    Having recently put a bike together for the first time, i then realised that i'd left the inner cover from the bottom bracket out when i put the cups in the frame!
    I was following the park tools webpage at the time, and since their diagram didn't show the inner cover present, i'd assumed it was just for holding the thing together during transport/sale

    So, my question is this: is the inner cover absolutely necessary? I guess it's job is to keep grit and rubbish from falling onto the spindle and into the bearings, but would the cranks die a sudden death without the cover??

    Thanks!

  2. #2
    AEO
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    Senior Member AEO's Avatar
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    nope.
    it does do a pretty good job of keeping the axle clean however.
    Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
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  3. #3
    Senior Member BCRider's Avatar
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    Not much dirt can get in there but water sure can. I'd suck it up and take it apart one more time to put the shield in place. Liberally grease it as well so the grease acts as water proofing.
    Model airplanes are cool too!.....

  4. #4
    Senior Member
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    If you have a seat post with a hole in it, all sorts of stuff will get in there. I swear that I've pulled 2-3 cups of stuff out of some bottom bracket shells. While this might not get into your bearings, it will scratch up your spindle, and little bits of grit jamming between the bearings and spindle may make removing the drive side crank difficult. Finally, water will get in there, and keeping water away from bearings is always a good idea.

  5. #5
    Senior Member draxine's Avatar
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    gotcha. thanks for the replies/advice!
    now, where did i throw that inner cover...

  6. #6
    Genius FlatMaster's Avatar
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    You need an Park Tool inner cover finder
    Ride or Die

  7. #7
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    Quote Originally Posted by FlatMaster View Post
    You need an Park Tool inner cover finder
    I hear the Pedros one is cheaper and lasts just as long.

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