I'm ready to order a set of Dunlop Z1 star specs from TR and got the question from the salesperson of whether the 275/35/18 will fit in place of the 265/40/18.

I looked at the wheel well and there appeared to be sufficient room for the extra .3" of tire section width but who knows.

I'm guessing there are dozens of people using this width on stock rims without rolled fender lips on this board, but would appreciate hearing that this tire size has been used ont he cayman successfully--thanks for any help.