245/65R17 designates a tire 245 mm (9.6") wide with a sidewall 65% as tall as it is wide — about 159 mm (6.3") — mounted on a 17-inch wheel. That works out to an overall diameter of roughly 29.5", a circumference of about 92.8", and approximately 683 revolutions per mile. Exact figures vary slightly by manufacturer and tread design.
Of the 110 245/65R17 tire models we track, the most common category is all-terrain (36 models), followed by highway all-season truck (32) — a good indicator of the kind of vehicles and driving this size is designed for.