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  1. #1
    Senior Member Woot! Woot! diamondback_man's Avatar
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    MTB Cranks On BMX BB

    Does that work? Would i be able to put an MTB crankset on a BMX size bottem bracket?
    "If you've been into freeriding for very long, then you are no stranger to the letters DBR. Diamondback was pioneering freeride and mountain biking and winning world titles in downhill before most people had evern heard about this type of riding."-Diamondback Ltd.

  2. #2
    NOT a weight weenie Hunter's Avatar
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    A MTB Triple? If so NO you cannot. Most BMX cranks are coupled with a Profile type b.b. spindle. Therefore making MTB cranks incompatible. Not to mention of course the chainline problems you would have. There are tons of BMX cranks out there that can be had.

  3. #3
    Wood Licker Maelstrom's Avatar
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    There are adaptors to support a mtb bb in a bmx shell.

    But why? Honestly bmx bb's are a lot stronger as are the cranks (usually).

  4. #4
    Senior Member Woot! Woot! diamondback_man's Avatar
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    Well, im gettin this norco 4Hun frame shipped to me, and i want to know if i can put my old MTB Crank on it.
    "If you've been into freeriding for very long, then you are no stranger to the letters DBR. Diamondback was pioneering freeride and mountain biking and winning world titles in downhill before most people had evern heard about this type of riding."-Diamondback Ltd.

  5. #5
    Senior Member
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    why would they put a bmx bb on an mtb? hmmm....

  6. #6
    ÖöÖöÖöÖöÖö Dannihilator's Avatar
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    Strength.
    Strike like an eagle and sacrifice the dove.
    Words and Stuff.

  7. #7
    The Rabbi seely's Avatar
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    Yeah they do it on a lot of urban/trials/fr hardtails these days it seems....

  8. #8
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    weird... so perhaps a bmx bb isnt really a bmx bb anymore!? gah!

  9. #9
    Wood Licker Maelstrom's Avatar
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    Its becoming the way it should have been on some boutique ht's and a couple big production ones. BMX bb is the way to go for street bikes and I think for dh too.

  10. #10
    Senior Member Woot! Woot! diamondback_man's Avatar
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    do you tink my LBS would have the adapter cups?
    "If you've been into freeriding for very long, then you are no stranger to the letters DBR. Diamondback was pioneering freeride and mountain biking and winning world titles in downhill before most people had evern heard about this type of riding."-Diamondback Ltd.

  11. #11
    Wood Licker Maelstrom's Avatar
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    To go from bmx to mtb or the other way around?

  12. #12
    NOT a weight weenie Hunter's Avatar
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    OK I get it I thought the question was to put a MTB crank on a BMX BB in a BMX frame. Sorry. Anyway companies like Profile, and Azonic makes a conversion for BMX BB's to work with MTB's.

  13. #13
    Senior Member Woot! Woot! diamondback_man's Avatar
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    ^how much do the cups cost around?
    "If you've been into freeriding for very long, then you are no stranger to the letters DBR. Diamondback was pioneering freeride and mountain biking and winning world titles in downhill before most people had evern heard about this type of riding."-Diamondback Ltd.

  14. #14
    NOT a weight weenie Hunter's Avatar
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    DB Man
    Azonic has their 454 englsh b.b avaiable to fit 10 spline cro-mo cranks it would be $60. Profile hs their conversion available it would be $70. However Profile is a 48 spline spindle. There are some BMX cranks that can work with a Profile spindle but no MTB cranks that I know of. Also with these conversions you have to run te corresponding spline pattern for the crank arms. You can get spiders with Profile or Azonic to run 1, 2, or 3 chainrings but with all the DH or FR cranksets available it would make more sense just to get a set of those. They for the most part are forged Cro-Mo and are typical to the BMX scene.
    I just wish people would have listened to Mark and I years back when we said to all the DH guys just to run BMX stuff on their rigs but no one would listen then. Now look at the current DH and FR scene, using BMX stuff is becoming the norm.

  15. #15
    Senior Member Woot! Woot! diamondback_man's Avatar
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    Quote Originally Posted by Hunter
    DB Man
    Azonic has their 454 englsh b.b avaiable to fit 10 spline cro-mo cranks it would be $60. Profile hs their conversion available it would be $70. However Profile is a 48 spline spindle. There are some BMX cranks that can work with a Profile spindle but no MTB cranks that I know of. Also with these conversions you have to run te corresponding spline pattern for the crank arms. You can get spiders with Profile or Azonic to run 1, 2, or 3 chainrings but with all the DH or FR cranksets available it would make more sense just to get a set of those. They for the most part are forged Cro-Mo and are typical to the BMX scene.
    I just wish people would have listened to Mark and I years back when we said to all the DH guys just to run BMX stuff on their rigs but no one would listen then. Now look at the current DH and FR scene, using BMX stuff is becoming the norm.
    i heard FSA makes one for only around 30$
    "If you've been into freeriding for very long, then you are no stranger to the letters DBR. Diamondback was pioneering freeride and mountain biking and winning world titles in downhill before most people had evern heard about this type of riding."-Diamondback Ltd.

  16. #16
    NCAA - DUAL CHAMPIONS! a2psyklnut's Avatar
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    Hunter, do you have a QBP catalogue handy. I have ordered a conversion kit for a customer. It's a reducer cup that presses into a BMX bottom bracket and is threaded on the "female" side to accept a standard catridge type bb.

    I think it was about $50! This way you can use ANY cartridge type bb.

    Let me do some searching.
    "Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW, What a Ride!" - unknown
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  17. #17
    NCAA - DUAL CHAMPIONS! a2psyklnut's Avatar
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    "Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW, What a Ride!" - unknown
    "Your Bike Sucks" - Sky Yaeger

  18. #18
    NCAA - DUAL CHAMPIONS! a2psyklnut's Avatar
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    "Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW, What a Ride!" - unknown
    "Your Bike Sucks" - Sky Yaeger

  19. #19
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    Quote Originally Posted by diamondback_man
    do you tink my LBS would have the adapter cups?
    ^how much do the cups cost around?

    Here......hold my hand and lets walk down to your bikeshop and ask!


    Come on...

  20. #20
    Senior Member Woot! Woot! diamondback_man's Avatar
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    Quote Originally Posted by KleinMp99
    Here......hold my hand and lets walk down to your bikeshop and ask!


    Come on...
    Nah, I think I can handle it on my own. But thanks for offering to come!
    "If you've been into freeriding for very long, then you are no stranger to the letters DBR. Diamondback was pioneering freeride and mountain biking and winning world titles in downhill before most people had evern heard about this type of riding."-Diamondback Ltd.

  21. #21
    NOT a weight weenie Hunter's Avatar
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    Quote Originally Posted by a2psyklnut
    Hunter, do you have a QBP catalogue handy. I have ordered a conversion kit for a customer. It's a reducer cup that presses into a BMX bottom bracket and is threaded on the "female" side to accept a standard catridge type bb.

    I think it was about $50! This way you can use ANY cartridge type bb.

    Let me do some searching.
    I was going by memory all my catalogues are at the shop. LOL anyway I did not know of the Crupi set I was going by what BTI has that I knew of.

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