FWIW, I own a set of each size mentioned. The ET Street Radials on the 8" are ooooooold and serve no other purpose than keeping those wheels from scraping the ground. The 10" have an unused set of the older ET Street Radials mounted already, which is why I know they're a tight fit. I bought the 9" wheels a couple of years ago when I stumbled across them thinking they might come in handy for just this reason.
2021 Challenger 6.4L Scat Pack 1320
100% stock: 1.680, 11.894 at 113.75 (DA 175 ft)
weight reduction, wheels, tires, Hellcat air box: 1.661, 11.686 at 115.97 (DA 710 ft)
1973 Challenger 452 ci street/strip [2008]
pump gas, DOT radials: 1.454, 10.523 at 126.44 (DA 514 ft)
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