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  1. #1
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    what type of BB is this?

    Hello all!

    I have a kona crankset I would like to put on my redline mono cog. My LBS said the crankset was some proprietary bmx set that requires an obsolete bb. Here is a picture of the exact crankset, obviously this picture is not mine as it includes the BB The crank arms have slits for a 10 spline bb. I want to say it is isis but the crank arm grooves are square.

    http://img331.imageshack.us/img331/1497/img08005aw.jpg

    Thanks in advance!

  2. #2
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    Looks like a Euro to me.

  3. #3
    Powerful-Ugly Creature Greyryder's Avatar
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    Ten splines? Might be Redline compatible spindle. Might be proprietary to that particular model of crank, too. Shouldn't be a big deal. if you don't need to replace the spindle or arms.

    I agree that it looks like a European bottom bracket. BMX doesn't generally sell the spindles with the bottom brackets, so you need to find out what the spindle diameter is. Should be either 19, 20, or 22 millimeter. 20mm isn't very common, that I've seen.
    Quote Originally Posted by Jack Burton
    When some wild eyed eight foot tall maniac grabs you by the throat and taps the back of your favorite head head against the barroom wall, and he looks crooked in the eye, and he ask you if ya paid your dues, you just stare that big sucker right back in the eye, and you remember what ol' Jack Burton always says at a time like that: "Have ya paid your dues, Jack?" "Yessir, the check is in the mail."

  4. #4
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    It's kinda hard to tell in the pic if those cups are threaded. If they are, then normally that would be "euro" but they also look like a larger diameter than a typical euro bb shell. Maybe they are supposed to thread in to an American-sized bottom bracket shell? If so, then I agree. That would be an obselete bottom bracket design. If you could press them into an American bb shell despite the 'threading', then the cranks and bb should work.....

  5. #5
    Powerful-Ugly Creature Greyryder's Avatar
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    Those are way too small to fit an American BB shell. Looking again at that picture, those look a lot like Redline Monster cranks; Single pinch bolt, and what appears to be a shouldered spindle. If that spindle is the same design as the Monsters, it takes a bottom bracket sized for a 20mm spindle. Might not be easy to find.
    Quote Originally Posted by Jack Burton
    When some wild eyed eight foot tall maniac grabs you by the throat and taps the back of your favorite head head against the barroom wall, and he looks crooked in the eye, and he ask you if ya paid your dues, you just stare that big sucker right back in the eye, and you remember what ol' Jack Burton always says at a time like that: "Have ya paid your dues, Jack?" "Yessir, the check is in the mail."

  6. #6
    coprolite fietsbob's Avatar
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    If you Have a OPC BB shell Frame, you need to buy an adapter. then thread those cups into the adapter.

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