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  1. #1
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    Can you bore a threaded BB to PF30?

    I have a carbon frame with derailleur hanger that I would like to turn into a singlespeed without the use of a tensioner. Is it possible to bore out the threaded BB to a PF 30 so I can use an EBB?

  2. #2
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    Reputation: wabiker3576's Avatar
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    I doubt it, I wouldn't .. just use one of these Philcentric Outboard Bottom Bracket Cups
    Phil Wood & Co.
    2013 Ellsworth Carbon Evolve XT
    2013 Ellsworth Enlightment XTR
    2013 Ellsworth Enlightment SS

    Bike Shop Employee

  3. #3
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    http://problemsolversbike.com/files/..._Reference.pdf

    BB30 is 42mm ID. PF30 is 46mm ID. You have to ask yourself if you can machine 4mm out of the ID and still have a strong enough shell (or any left at all most likely.)

  4. #4
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    Reputation: Berkley's Avatar
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    Quote Originally Posted by smdubovsky View Post
    http://problemsolversbike.com/files/..._Reference.pdf

    BB30 is 42mm ID. PF30 is 46mm ID. You have to ask yourself if you can machine 4mm out of the ID and still have a strong enough shell (or any left at all most likely.)
    I believe the OP has a standard threaded BB shell, in which case it definitely will not work.

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