Brainstorm needed from wide wheel experts

[kcpaz]

Okay, so on my Boxster, I'm going to be running 17x10" and 17x12" CCW Classics (yes it's flared) and I'm trying to double check my logic in regard to the offsets needed. The car will have aftermarket coil-overs, and I would rather error on the side of slightly too much offset and "fine-tune" the fit away from the shocks with spacers. I have talked to John at CCW and his estimation was +32mm in the front, and +19mm in the rear. After crunching some numbers, I think these figures are pretty darn close but I wanted to check with the "masses" just to get a third opinion before I order.