BMX cranks on mtb?

I keep seeing cranks like these around and quite fancy them in 175 or 180mm.
Can they be used with MTB? 1 x 7 is all I'm after so the single ring is fine, I'm more wondering about that odd looking axle and finding a BB to suit

http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=280594472693&ssPageName=STRK:MEWAX:IT

Those appear to have the correct MTB cup/bearings that you're looking for.

Here's an assembled set of Profiles w. the MTB cups.



On the bike.

Short answer: I'd stick with Profile.

There are many different types of 3-piece BMX cranks - Many of them use a proprietary axle. Even several different versions of the Redline cranks & axles that you linked to.

Different number/ shape splines etc. etc.
None of them are interchangeable.

The 48-spline Profile axle is also used by other companies and is the only "standard" format. So spares are easier to find.

Profile offer various BB cups, spacers and axle lengths to suit bikes that use a European BB shell or to give decent chainline when using a 135mm rear hub. They also make MTB spiders, so you can use an existing chainring for decent gearing options, rather than a 1-piece BMX chainwheel.

Fitting Profiles is a PITA involving a large hammer and improvisation.
But, once fitted, the crank is likely to outlive you.

Two excellent posts. Thanks chaps :!:

I'll pay careful attention to the shape of the axle/spines while hunting and if a pair of profiles presents themselves in the meantime I'll take the easy road.