Offset depends on if you're rolling fenders or not as well as how much camber you're going to run. A +45 will fit with ease with rolled fenders. I have +40 9 inch with my 255 and actually run an 8mm spacer as well as have a essentric lca tgats pushed out 3/8 inch over stock running 2.5 camber and could even move it out further. If you're willing to roll fenders you gain a lot of room.

 

 

255-35-18 Toyo R888R on HRE 18X8.5. Just factory rolled fenders no other work.

 

Thx guys,
i guess the best tire for me will be the 255/35 cause its smaller than 235/40 diameter wise (around 10mm). Thats alot. I will use Yokohama A052 tires cause i can go the 996 GT2 size or the 255/35+295/30 route.
Lets see what will peform better on the racetrack.

 

Well, i was on the track. It was quite wet and slippery i did use the toyos r888 in GT2 size.
They performed really good. The track got dry later so i could run some fast laps.
the grip over the tt standard is hugh.
245 or 255 would be even better.
Well lets see which tite is available next year.

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A little more fun without curbs and astroturf cause of the wet track before.

 

am running a 245/40-18 without any rub.. no rub 'mods'

 

Depends on the hardware.
My 235/40 isnt rubbibg with 8.5x18 Offset 40 rims. There is 5 mm spacer between fender and tire when compressed to the fullest.
Could get tricky with the 245/40.
witz 255/35 there will be more space cause the tite is in diameter smaller