285/70R17 Tire Size in Inches — Diameter, Width & Specs
A 285/70R17 tire is 32.71 inches tall (overall diameter), 11.22 inches wide, with a 7.85-inch sidewall, on a 17-inch wheel. In millimeters: 831 × 285.
285/70R17 drawn to scale — diameter, sidewall and rim from the size code.
Full specifications
| Measurement | Inches | Millimeters |
|---|---|---|
| Overall diameter | 32.71 in | 831 mm |
| Tire width | 11.22 in | 285 mm |
| Sidewall height | 7.85 in | 200 mm |
| Circumference | 102.8 in | 2610 mm |
| Revolutions per mile (nominal) | 617 | |
| Wheel (rim) diameter | 17 in | 432 mm |
Same-diameter alternatives (17" rim)
| Size | Diameter | Width | Diameter difference |
|---|---|---|---|
| 33x12.50R17 | 33" | 12.5" | 0.89% |
Popular comparisons with the 285/70R17
Load index & speed rating — how to read them
The size code is only half of the sidewall. After it comes a load index and a speed letter, like 121R. Load index 121 means one tire carries up to 3,197 lbs at its rated pressure; speed rating R means up to 106 mph. A replacement tire must meet or exceed both numbers on your vehicle's door-jamb placard. Calculate another size or compare two sizes.
How tall is a 285/70R17 tire?
32.71 inches overall diameter (831 mm), from the standard size formula. A specific brand's measured height can differ by a few tenths.
How wide is a 285/70R17?
11.22 inches (285 mm) at the casing's widest point, unloaded.
What does 285/70R17 convert to in flotation (inch) sizes?
Its diameter is 32.71", so the nearest flotation class is 33-inch tires (e.g. 33x12.50R17 where that size exists). Use the converter for exact near-matches.
Nominal geometry — method. Last verified November 12, 2026.