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Thread: Why BB30?

  1. #1
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    Why BB30?

    Just looking over the Camber and the SJ for my girlfriend for next year and I notice they have BB30. Does anyone know why Spesh would do this? I recently had to replace the BB30 bearings on my Cannondale road bike and it's a huge pain in the a$$.

    What was wrong with threads? Now you need a hammer and a special press and loctite and you have to wait 24 hours for the loctite to harden? You run the risk of ovalizing your bb shell every time you change bearings and if so your frame's now garbage? One more thing I can't fix myself....

  2. #2
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    I believe it's PF30...not BB30 on these bikes. It uses sleeves to hold the bearings..no need for loctite. Mine has been fine..no need to worry about it IMHO.

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    Geologist by trade...bicycle mechanic (former) by the grace of God!

    2012 Specialized Stumpy EVO 29 HT

  3. #3
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    My SJ uses a PF30, it's a 2013 comp hardatail

  4. #4
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    Quote Originally Posted by SJDude View Post
    Q: Does anyone know why Spesh (and the cycling industry) would do this?
    A: One more thing I can't fix myself.
    I think you already figured it out

  5. #5
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    Quote Originally Posted by SJDude View Post

    What was wrong with threads? Now you need a hammer and a special press and loctite and you have to wait 24 hours for the loctite to harden? You run the risk of ovalizing your bb shell every time you change bearings and if so your frame's now garbage? One more thing I can't fix myself....
    Designed to allow more flexibility for the manufacturers in their build of frames - BB30 is very critical of tolerances whereas PF30, due to its plastic cups allows more latitude. The benefits of using of an alloy 30mm spindle rather than the steel 24mm Shimano (or GPX) spindle is a mater of eternal debate.

  6. #6
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    Why BB30?

    Quote Originally Posted by skiwi View Post
    The benefits of using of an alloy 30mm spindle rather than the steel 24mm Shimano (or GPX) spindle is a mater of eternal debate.
    One benefit of the alloy 30mm spindle is that when your bottom bracket is full of water you'll get clear water, rather than brackish brown water dripping out from inside. The steel spindle of my Shimano Deore XT chainset is gently rusting away.

  7. #7
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    The best justification I've read is that putting threads in a plastic frame sucks, adds weight, and costs money. The new 30 mm spindle standards don't require the frame to be threaded, so better compatibility with the plastics a lot of high-end bikes are made of now.
    "Don't buy upgrades; ride up grades." -Eddy Merckx

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