235/70R17 designates a tire 235 mm (9.3") wide with a sidewall 70% as tall as it is wide — about 165 mm (6.5") — mounted on a 17-inch wheel. That works out to an overall diameter of roughly 30.0", a circumference of about 94.1", and approximately 673 revolutions per mile. Exact figures vary slightly by manufacturer and tread design.
Of the 13 235/70R17 tire models we track, the most common category is highway all-season truck (8 models), followed by all-terrain (3) — a good indicator of the kind of vehicles and driving this size is designed for.