Frame switch, BB sizing?

Rozza
Rozza Posts: 75
edited July 2011 in MTB workshop & tech
I've got a Ragley MMMBop and am want to switch the kit I have on it to an On One 456 Carbon. I'm not sure about the bottom bracket size differences though, the Ragley has a 68mm BB shell, while the 456 has a 73mm BB.

What are the implications of the 5mm difference? I have a SLX double and bash on at the moment, will I need a new BB, crank?

:?
Wolf Ridge, mmm bop, XTC Composite, Uncle John

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