the factory 19" ZLE wheel is not knurled but the '14-'15 19" Z/28 wheel is knurled. My last two new 3Rs took .75 oz and 1.25 oz to balance so no big deal if you don't balance them. I balance mine myself so this is real data. Make sure you cover the adhesive wheel weights with the foil like racers tape and your weights will never fly off.
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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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