Quote:
Originally Posted by SlingShot
The OEM sizes were 245/45 front and 275/40 rear. You can go up 1 size without any issues. You could go 255/40/20 front and 285/35/20 rear without problems on stock rims. I personally would get an alignment with the fresh tires.
Living in Lake Orion for many years, I'm very familiar with Clarkston road, and your car will handle much different with matching brand of tires, and lower profile in the rear.
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SlingShot is 100% correct that you can run the 1 step up in width. You'll get a couple of benefits from doing this but there is also some minor downsides.
Benefits are more contact patch and if you have a very sensitive butt dyno, you may be able to feel the increased torque multiplier by switching to the smaller diameter... you should get 2.8% improvement in torque multiplication.
Downsides are if you are stock ride height, you'll get a little more wheel gap of about 0.4". Also your speedo will read 2.8% higher than your actual speed... meaning when your speedo says 70, you are really going 68. That might be good if you are prone to speeding tickets though.
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2010 2SS/RS LS3 - K&N, GM Performance Axle Back, Hurst Shifter, TSP 1 7/8ths long tubes no cats, TSP Stage 2 "Bald Eagle" cam, GM 3.91, 466whp/429tq