Yup, those are very close to stock specs & Camaro SS Specs. Stock GT Wheel specs are 8x19 +48 (All 4 Wheels) & Camaro SS Wheel specs are Fronts: 8x20 +35 & Rears are 9x20 +40. If you wanting reference for a more aggressive specs Stock CTSV V2 (Sedan) wheels are 9x19 +51 Fronts & 9.5x19 +56 Rears (These on a lowered car will require fender rolling to prevent rubbing). I've ran all of these specs on my 09 GT without any rubbing Issues (I also have the GXP Brembo 4 pot front brakes), Granted tire size is gonna play a factor in if its gonna rub or not. My personal suggestion is stay close to stock tire specs. Don't go too aggressive and if your gonna go wider then shorter side walls, Mainly want to keep the overall tire height near stock specs or a little under. Another great tool to use is Willitfit.com and you can compare before & after wheel/tire specs to see how much of a difference there will be.