[LarThaL]

I am going to change out the miserable Continental Contisport tires that came on my '11 M3 ZCP. They will be replaced with Michelin PS2. My question is related to sizing:

Option #1:
Stay with stock sized tires. Going to the better tires will be enough to give me the much needed added grip.

Option #2:
255/35 front and 275/35 rear. Slightly more rubber all around. Maintains the F/R size differential, but the 255's are 2 lbs heavier each than the 245's.

Option #3:
Stay with 245/35 front and go to 285/30 rear. This will maximize rear grip while giving identical front/rear rolling diameter. The 2% decrease in rear diameter shouldn't affect DSC too much and make driving without DSC much more enjoyable.

Right now, I am running 12mm spacers all around. I would keep these in front. I am not sure whether I could fit the rear 275's with the spacers and if I got the 285's, the rear spacers would obviuosly need to go.

Any and all input appreciated. Thanks.