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Originally Posted by Kroggers
This is all good stuff and I am starting to get a better picture regarding the options now...
Yes, we are talking about my SC, but I am based in Sweden so do not have to worry about the regulations that you have over there. Also Hoosier are not that easy to find over here, so at the moment I am running Toyo R888.
The car is a street legal / registered race car - mainly so that I can (if I want to) run it on the road for a quick spin on a sunny weekend afternoon, and also as the regulations within the Swedish Porsche Club dictates that all cars that are driven must be road registered...
Like I said, I like the RUF wheels that are on the car, but they are heavy. I will either get a second track set-up or replace them for a new set to use all the time. Just looking to understand if I would benefit from 18" or 15". The main factor is that to stay road legal I need to maintain the factory overall size - so the indicated speed does not go out of spec.
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What do the authorities consider to be the overall size originally? 225/50x16? which is ~24.7" How much wiggle room?
I'd say that for Toyo R888 or RA1 you'd want 255/40x17(25.1") on a 9.5x17ET19 wheel and in front 235/40x17 on an 8ET25-31 wheel,
in R888 you could also go 225/45 x16 on 8ET25-31 and 245/45x16 on 9ET12-15. These are 23.8/24.4" respectively. for stock brakes this is fine but w/ most bbks you'd want 17s
The other street legal tire that might work for you is the Michelin Pilot Sport Cup but there are fewer choices there and you'd have to go to 18s
225/40x18 on 8 and 265/35 x18 on 9.5. these tires are 25.1 /25.2" tall respectively