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@gizmond
Q factor of track cranks is normally in the 130s (131-139 for the popular models)
http://www.businesscycles.com/tr-refspec.htm
The narrowest (that I know of) outboard are the DA road at 145 (I think), most outboard road are up in the 150s
Edit - and I read somewhere that the truvativ omnium have a 148mm Q factor