235/75R15 designates a tire 235 mm (9.3") wide with a sidewall 75% as tall as it is wide — about 176 mm (6.9") — mounted on a 15-inch wheel. That works out to an overall diameter of roughly 28.9", a circumference of about 90.7", and approximately 698 revolutions per mile. Exact figures vary slightly by manufacturer and tread design.
Of the 73 235/75R15 tire models we track, the most common category is all-terrain (36 models), followed by highway all-season truck (17) — a good indicator of the kind of vehicles and driving this size is designed for.