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 Post subject: BMX cranks on mtb?
PostPosted: Sun Dec 05, 2010 8:44 am 
Retro Guru
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Joined: Sat Aug 01, 2009 12:25 pm
Posts: 577
Location: Australia
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


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 Post subject:
PostPosted: Sun Dec 05, 2010 4:51 pm 
BoTM Winner / Gold Trader
BoTM Winner / Gold Trader
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Joined: Fri Feb 26, 2010 12:36 am
Posts: 4724
Location: Burlington, ON Canada
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.

Image

On the bike.

Image


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 Post subject:
PostPosted: Sun Dec 05, 2010 9:17 pm 
Retro Guru
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Joined: Thu Aug 23, 2007 9:19 pm
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Location: Europa
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.


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PostPosted: Sun Dec 05, 2010 11:56 pm 
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Joined: Sat Aug 01, 2009 12:25 pm
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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.


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