[vtirocz]

Originally Posted by Alpha1BC

Switching to wider fronts like that will give the car a natural tenancy to oversteer rather than the nearly neutral characteristics it has with the OE tires and track alignment. There's a couple of ways to compensate for that with suspension component and/or alignment changes, though.

I wouldn't be concerned about the speedo that much. 3% is ~2 mph at highway speeds. There is a way to correct through a tune, but not worth going through that whole process for only a speedo change when it's not that far off IMO.

Lastly, with a front spacer that big, you're going to want longer wheel studs since the OE ones won't have enough thread engagement. I'd assume ARP makes some that are 12-ish mm longer, but I believe the wheel studs from the Silverado are also the same material grade as the camaro but longer.

Personally, if it's feasible for you, I'd recommend going with a separate set of 19" wheels and tires for track use and keep your current OE wheels with less aggressive tires for street and wet track use. 19" 305 square setup is pretty easily accomplished, you'll have a better selection of tires to choose from in that size for the track, and you don't have to make any sacrifices for driving on the street.

Thanks for that feedback! One point I'd make is that the general consensus from review is that the SS (non-1LE) is set up to understeer (SS 1LE is probably closer to neutral). For instance, Randy Pobst gave it a 3.5 - 4 (on a scale of 10) for tendency to understeer. The square setup would directionally help with this, but not sure if it would go to far.

See 9:14 in this video for his comments:

Regarding the 12mm spacers, I'd definitely replace the studs and would plan to use them both front and rear in order to push all wheels out 12mm compared to the stock setup. It's only needed in the front though for clearance.

Thanks for the recommendation on a 19" setup. I will look into that.

Originally Posted by Vtor_ZL1

If you can fit 285, why not. That's my daily setup.. going on 11,000+ miles.

Thanks. According to Goodyear, the 285s fit on a 9.5" wide wheel. Based on the table calculations above, they should fit within the window of current tire size offerings on the SS.