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Old 06-02-04, 05:03 AM   #1
diamondback_man
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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?
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Old 06-02-04, 09:34 AM   #2
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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.
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Old 06-02-04, 10:52 AM   #3
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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).
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Old 06-02-04, 05:11 PM   #4
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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.
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Old 06-02-04, 06:29 PM   #5
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why would they put a bmx bb on an mtb? hmmm....
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Old 06-02-04, 06:41 PM   #6
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Strength.
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Old 06-02-04, 06:58 PM   #7
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Yeah they do it on a lot of urban/trials/fr hardtails these days it seems....
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Old 06-02-04, 07:02 PM   #8
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weird... so perhaps a bmx bb isnt really a bmx bb anymore!? gah!
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Old 06-02-04, 07:10 PM   #9
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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.
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Old 06-02-04, 07:33 PM   #10
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do you tink my LBS would have the adapter cups?
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Old 06-02-04, 07:48 PM   #11
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To go from bmx to mtb or the other way around?
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Old 06-02-04, 11:05 PM   #12
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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.
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Old 06-03-04, 06:30 AM   #13
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^how much do the cups cost around?
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Old 06-03-04, 09:42 AM   #14
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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.
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Old 06-03-04, 03:14 PM   #15
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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 $70. However Profile is a 48 spline spindle. There are some BMX cranks that can work with a Profile spindle but no MTB cranks that I know of. Also with these conversions you have to run te corresponding spline pattern for the crank arms. You can get spiders with Profile or Azonic to run 1, 2, or 3 chainrings but with all the DH or FR cranksets available it would make more sense just to get a set of those. They for the most part are forged Cro-Mo and are typical to the BMX scene.
I just wish people would have listened to Mark and I years back when we said to all the DH guys just to run BMX stuff on their rigs but no one would listen then. Now look at the current DH and FR scene, using BMX stuff is becoming the norm.
i heard FSA makes one for only around 30$
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Old 06-03-04, 03:25 PM   #16
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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.
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Old 06-03-04, 03:30 PM   #17
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Here's some: http://mikesbicyclecenter.com/site/p...129&SKU=CR9121

Pricey!!!!

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Old 06-03-04, 03:33 PM   #18
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http://www.bikeusa.com/MERCHANT2/mer...ct_Code=CR9121

A little cheaper!!!

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Old 06-03-04, 03:55 PM   #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...
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Old 06-03-04, 04:12 PM   #20
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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!
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Old 06-04-04, 10:10 PM   #21
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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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