I'm not sure there is a standard sizing on cams. Company one might have an A11 with the same specs as a different company's A10.
It might be out of date but here is a thread on Scootdawg they started listing cam specs.
http://scootdawg.proboards.com/threa...ms-a10-a11-a12
It's a start if nothing and I've seen bigger threads with more info if I can remember where.