235/85R16 designates a tire 235 mm (9.3") wide with a sidewall 85% as tall as it is wide — about 200 mm (7.9") — mounted on a 16-inch wheel. That works out to an overall diameter of roughly 31.7", a circumference of about 99.7", and approximately 636 revolutions per mile. Exact figures vary slightly by manufacturer and tread design.
Of the 81 235/85R16 tire models we track, the most common category is all-terrain (45 models), followed by highway all-season truck (33) — a good indicator of the kind of vehicles and driving this size is designed for.