Those with Michelin PS2's
 

Im switching from Conti's to the PS2's, and Im wondering if anyone went with 305/30 as opposed to 315/25?

I wouldn't mind having a little more sidewall in the back. Any input would be appreciated.

I got the 315 as they do not make the 305 for 18 inch rims.

Get 295s if you want more sidewall.

From your avatar, I assume they are 19". I've switch from 295-30-19 to 315-25-19. 295 is 1/2 inch taller than 315 and factory size. 305-30-19 will be even taller than 295. Of course 295 or 305 will have more sidewall but it look too fat for me. My suggest will be 315.

I run 235/35/19 and 315/25/19 on 19x8.5 and 19x12. That is the best size for that rim.