1. are these for auto-x only? or will they be your street driven tires?
2. Are you running in stock class or other? (i assume stock, which is why you're shooting for the 140TW?)
- You could also switch to 235/40's on your stock rims (24.4" vs 24.6" @215/45) without going any taller.
- If you're not staying in stock class, you could drop to some lightweight 16x8's or something? Course 16" rubber is getting harder to find. Stupid stock cars these days all running 19's n 20's.... etc. Wonder what brakes the br-z actually has? will 15's clear... (and this just leads me off into brake-upgrade-land thoughts...)