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stock goodyears are fine in the 20" 3s. 3rs come in the 19" 1LE sizes 325/305. Amazingly, 3rs are available in 20" now only 305/30-20. I have a few peak g readings nearly 1.4g on the stock 3s so you will be fine on the stock tires. They have great tread life on track compared to the 3rs which have excellent grip but abysmal wear.
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'21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60'
'17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold)
'15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold)
'12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold)
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