265/60R20 designates a tire 265 mm (10.4") wide with a sidewall 60% as tall as it is wide — about 159 mm (6.3") — mounted on a 20-inch wheel. That works out to an overall diameter of roughly 32.5", a circumference of about 102.2", and approximately 620 revolutions per mile. Exact figures vary slightly by manufacturer and tread design.
Of the 59 265/60R20 tire models we track, the most common category is all-terrain (40 models), followed by highway all-season truck (15) — a good indicator of the kind of vehicles and driving this size is designed for.