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A 20 inch wheel is the Mustang, Charger, Challenger, Camaro and Model Y size and the largest that still rides on a car. The sidewall is 30 to 35 series, so potholes count, and the tire bill is higher than 18 or 19. Staggered 20x9 and 20x10.5 or 20x11 is the muscle car setup. The brake caliper behind the wheel sets the smallest diameter a car takes. What is left over is sidewall, and sidewall is what soaks up a pothole.
1,504 designs on this site come in 20 inch, in 11 widths from 5 to 12 inches wide. 20x9 has the most designs (847), then 20x10 (585). The bolt patterns with the most 20 inch designs are 5x114.3, 5x120 and 5x112. Diameter is the easy part. Width and offset are what rub, so pick your car and the page keeps only the 20 inch sets that clear the brakes and fenders, with the aggressive stance option if you want the wheel out at the fender.