[BradfordCamaro]

Alright.
Talked to the experts.
275/40 on a 9.5" rim will allow proper tension on the sidewall.
Tread width and contact patch will be similar to a 285.

[chuckclanton]

Originally Posted by Imp

As mentioned in the other thread, I plan on downsizing to 19s and going from there. Tire sizes are up in the air right now, as it depends on who has good widths 19s. TireRack lists two new RE71s in 265/35 and 265/40... but no specs on them yet. I wonder if one of those might be the magic bullet for the front. I'll have to ask TR about it.

If I get the SS (i.e., if the 1LE doesn't make me wait), then I'd be looking at 285s for the rear and 265s (if available) or 245s for the front. RE71 definitely because they're the only 'fast' tire that has good 19s right now.

--kC

SCCA F/Stock requires you to run 8.5in front wheels and 9.5 in rear. Wheels. 19 or 20 inch. That said the RE71s 245/40/19 and 275/35/19
are the only proper fit. The car DOES NOT have an understeer issue
requiring a square setup like the GEN5.

[Imp]

19, 20 or 21.

--lC

[chuckclanton]

Originally Posted by Imp

19, 20 or 21.

--lC

With 21 in. you are stuck with Pirelli P-Zeros. Not as good as the Goodyears.

[Imp]

Just covering all the bases for the rules. You can go +/- 1".

--kC

[mcynet]

I think I'VE DECIDED....

Front 265/40/19
Rear 285/35/19

It should maintain the car balance and put the max rubber on the road with out to much pinch.