Bike Forums - Bmx cranks on mtb

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mtnbk3000

10-31-07 05:03 PM

Bmx cranks on mtb

I know that you can get profile cranks to fit on mtb's. Are the bb's the same for both bmx and mtbs ( i know that there are different sizes for mtbs, 68mm and 73mm, is the same true for bmx?) But other than that is it possible to get a bmx crank to fit on an mtb?

Svr	10-31-07 06:04 PM

As far as mounting Profile type BMX cranks, you'll need the euro BB and the correct size internal spacer to fit different width BB shells.

Installation guides are here:http://www.profileracing.com/downloads_home.php

dminor

10-31-07 08:05 PM

FSA makes English cup BMX BBs, as does Gusset (Pygmy). 68 and 73 widths are plentiful; usually the MTB-cup ones come with enough spacers to do either BB shell. 83 is the problematic width - - less available because you need such a long spindle.

colombo357

10-31-07 09:40 PM

Profile makes a 6.875" spindle for 83mm BB shells. The cups are the same. Add more spacers.

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