Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
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You're talking about replacing a one piece crank, right? I've never tried it but I suspect that it would fit providing the bottom bracket shell widths are the same. That's a big assumption - I'd want to do the measuring myself.
I'd be concerned about chainline issues. Assuming you're putting it on a derailleur geared bike the chain probably isn't going to fit on the BMX chainring either.
Finally, if you've never installed a BMX 3-piece crankset, the first time can be an interesting experience.