275/70R17 designates a tire 275 mm (10.8") wide with a sidewall 70% as tall as it is wide — about 193 mm (7.6") — mounted on a 17-inch wheel. That works out to an overall diameter of roughly 32.2", a circumference of about 101.0", and approximately 627 revolutions per mile. Exact figures vary slightly by manufacturer and tread design.
Of the 18 275/70R17 tire models we track, the most common category is all-terrain (18 models) — a good indicator of the kind of vehicles and driving this size is designed for.