Have an opportunity to pick up some widebody offset 18s with Hoosiers. Been running 19inch with MSPC at track for a couple of years. Assuming the fitment is appropriate anything else to be concerned about? Alignment? Assuming speedo will still be accurate? etc...

Thanks

 

well, i've been thinking about this for while also. just make sure the height difference b/w Front/Back is similar as not to damage your Diff.

 

Yes, as Kosmo said, make sure the overall diameter is close to the stock diameter so that the differentials don't freak out and toast.
Other than that, if they clear your brakes and suspension you should be good to go. Generally the smaller wheel will be lighter and the larger tire will soak up some of the harshness of the track. You may notice more sidewall flex, but on the hoosier you will probably be fine (they are built for that abuse after all)

 

I believe its a no go if you have pccb's

 

Nothing to be worried about.
Pick the correct size so you can have the front / rear difference close to factory. Not a problem, a lot of options out there.
Overall diameter doesn't matter much, what matters is the front / rear difference for AWD system.
Choose a strong wheel. I always advise my clients that I see 2 options (2010 + GT3 RS) in the market.
Option 1 - OZ wheels, cost effective, good quality easy replacement if needed.
Option 2 - BBS, best look in my opinion, great weight savings, easy to find parts for, as every single shop that support cup cars use them, and keep their value in case you want to resell them in the long run.

In your case you also have CCW which is a great value and can be custom made to your needs.

All mentioned wheels will clear PCCB or 380mm OEM brakes without any concern.
Tire flex is not a concern as you will use the 'same' specs, just smaller diameter.

Also once you chose your tires, make sure the alignment is done properly for your tires and also check ride height and corner weight (should be done every time anyway) so you know your rake is in check (for rake= front / rear height delta)

 

Thanks for input.

The wheels are 18 CCW C10s. Tires are 255 up front 315 in rear. They are coming off my friends GT3 RS. No PCCBs so should be no clearance issues. Will ensure alignment and total diameter are good. Car has full TPC stage 3 suspension including custom spring/damper Bilstiens.

Trying to get to a 2:05 at VIR this season.

 

Good luck 2:05 is moving