245/75R17 designates a tire 245 mm (9.6") wide with a sidewall 75% as tall as it is wide — about 184 mm (7.2") — mounted on a 17-inch wheel. That works out to an overall diameter of roughly 31.5", a circumference of about 98.9", and approximately 641 revolutions per mile. Exact figures vary slightly by manufacturer and tread design.
Of the 97 245/75R17 tire models we track, the most common category is all-terrain (54 models), followed by highway all-season truck (35) — a good indicator of the kind of vehicles and driving this size is designed for.