245/70R17 designates a tire 245 mm (9.6") wide with a sidewall 70% as tall as it is wide — about 172 mm (6.8") — mounted on a 17-inch wheel. That works out to an overall diameter of roughly 30.5", a circumference of about 95.8", and approximately 661 revolutions per mile. Exact figures vary slightly by manufacturer and tread design.
Of the 123 245/70R17 tire models we track, the most common category is highway all-season truck (48 models), followed by all-terrain (48) — a good indicator of the kind of vehicles and driving this size is designed for.