265/70R18 designates a tire 265 mm (10.4") wide with a sidewall 70% as tall as it is wide — about 186 mm (7.3") — mounted on a 18-inch wheel. That works out to an overall diameter of roughly 32.6", a circumference of about 102.4", and approximately 619 revolutions per mile. Exact figures vary slightly by manufacturer and tread design.
Of the 102 265/70R18 tire models we track, the most common category is all-terrain (57 models), followed by highway all-season truck (33) — a good indicator of the kind of vehicles and driving this size is designed for.