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  1. #1
    thread crapper
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    BMX cranks/BB on MTB

    So, I have a buddy that rides a lot of BMX and wants to build up a MTB with some of his parts laying around. Can you run a Euro BMX BB on a MTB?

  2. #2
    Former Bike Wrench
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    Aren't Euro BMX and ISO the same...its been a few years but I believe they are the same 1.37" x 24 tpi

  3. #3
    thread crapper
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    From what a mechanic has told us it should work, in theory... He worries that it won't fit ideally and could cause added wear on the bearings.

  4. #4
    Nouveau Retrogrouch SuperModerator
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    Quote Originally Posted by scottap2003 View Post
    So, I have a buddy that rides a lot of BMX and wants to build up a MTB with some of his parts laying around. Can you run a Euro BMX BB on a MTB?
    BMX Euro is the same as mtb threaded english. No difference at all, except some mtb shells are 73mm wide rather than 68. A Profile-type BB just needs a different bearing spacer.
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  5. #5
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    absolutely, euro BB with a 19 mm bmx spindle. you can run a spider to most BMX cranks to run a MTB chainring if your going to do a chain guide and gears. but most newer DJ frames use press in BB bearings just like BMX. integrated headsets too. MTBMX! lol

  6. #6
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    Slightly tangental this:

    You can press Spanish BB bearings into Shimano Hollowtech II cups to make a 19mm axle fit bottom bracket for mtbs. I've had a lot more sucess with this than using Euro size BMX bbs as they tend to be kinda weedy and vulnerable to mud/water ingress.

    A few manufacturers are making off the shelf versions too now, Deity and Profile certainly have them available.

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