I think you struck a good compromise with those sizes. Agreed: 315/17 look mean as hell but im not sure they will be available forever.

I was thinking 8s and 10s for my otherwise stock 930

the 8s and 10s are all fine and dandy, however, when you start putting real power down even 315s scream in anger. i will be looking into 335s next as i am on my 2nd set of rears same fronts which are now so heat cycled i gotta pitch them here soon as the rears are smokin away.working on gear selected boost control with the ms3 so i can have 1st go to 10#s 2nd to 15#S 3rd to 20 and 4th to the moon!!!maybe then i can have a set of rears last more than 8k