235/75R16 designates a tire 235 mm (9.3") wide with a sidewall 75% as tall as it is wide — about 176 mm (6.9") — mounted on a 16-inch wheel. That works out to an overall diameter of roughly 29.9", a circumference of about 93.9", and approximately 675 revolutions per mile. Exact figures vary slightly by manufacturer and tread design.
Of the 16 235/75R16 tire models we track, the most common category is highway all-season truck (10 models), followed by all-terrain (5) — a good indicator of the kind of vehicles and driving this size is designed for.