235/80R17 designates a tire 235 mm (9.3") wide with a sidewall 80% as tall as it is wide — about 188 mm (7.4") — mounted on a 17-inch wheel. That works out to an overall diameter of roughly 31.8", a circumference of about 99.9", and approximately 634 revolutions per mile. Exact figures vary slightly by manufacturer and tread design.
Of the 82 235/80R17 tire models we track, the most common category is all-terrain (43 models), followed by highway all-season truck (32) — a good indicator of the kind of vehicles and driving this size is designed for.