15x8 and 17x9 is a really good way to go. I am going this direction on the BWR SSM car. I have been investigating for quite some time, but 949 didn't offer 4x100 in the 17s previously. BWR is working on a forged combo like this now, but it is a few months out. The 949 wheels are excellent, very light for a cast wheel, and priced well. The trick will be clearing the front brakes stuffing a full 15x8 and 17x9 under the Elise clams. It can be done, just needs to be perfect.
Emelio, do you have a target release date for the 17x9s in 4x100 and what offset? Tried to send you a PM but you have them turned off.
Sorry about the PM's. On too many forums and can't keep track of message threads on the smartphone if I use them. Good talking with you this morning.
Nothing like an ETA yet. Agreed on Exige brakes, might be easier to just run 17's up front. 205/40/17 or 215/40/17 gives the right OD, wider and more choices than 16's.
I see the need to accommodate three different types of tire with one or two wheel fitments:
(Extreme High Performance) for street, autocross and HPDE: RS3, Kumho XS, RE-11 etc
DOT R medium
compound: NT01, Hankook C51, RA-1
DOT R soft
compound: Hoosier A6 mainly. To a lesser degree Hankook C71, Eagle RS, BFG R1