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Have just bought a middleburn with this Isis bb, its a 68 x 113mm, my bb shell is 73mm. Would I be able to get this to fit? Also, what does the 113mm measurement refer to?
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113 is axle length.
I'd check with middlebrun re shell width - crank bros just use a spacer to differentiate between the two but I can see you'd end up with the axle off centre if you weren;t careful.
As it screws in till it's flush you'd have (113-68)/2 = 22.5mm of axle on one side but only 22.5 - (72-68) = 17.5 on the other...
Can also be used on 73mm std BB shell
From the Gusset [url= http://www.gussetbikes.com/products-information.php?id=BBGUIS63 ] webpage[/url] leads me to believe that it will work for you.
The photo there shows the BB with a spacer on the drive side, which is the way that most cartridge BBs fit a 73 mm shell.
Edit - If you need a spacer, I'd bet that most shops have a bunch of extras lying around...