tireheight.com285/70R20 in inches
A 285/70R20 tire is 35.7″ tall and 11.2″ wide, and fits a 20″ wheel. In inches it is written 35.7×11.2R20.
How tall 285/70R20 tires really are
Heights published by Toyo for the one tire in this size. Their published revolutions per mile work out to 34.7″ under load (below).
The one tire listed, the Toyo Open Country A/T III EV, measures 35.70″: 0.01″ shorter than the size code's 35.71″.
Published revs per mile (581) mean the tire rolls like a 34.7″ tire on the vehicle. Use this for speedometer calibration.
1 tire in 285/70R20
Sort by the spec you care about.
Is 285/70R20 a 36-inch tire?
Yes. The size code works out to 35.71″, and the 1 tire here publishes 35.70″, so people call it a 36.
All 36-inch tire sizes, on every wheel size.
A true 36×15.50R20 is 0.29″ taller on paper and 4.3″ wider.
Compare with nearby sizes
Differences in overall diameter, calculated from each size code.
| Size | Diameter ″ | vs 285/70R20 | Difference |
|---|---|---|---|
| 285/65R20 | 34.59 | -1.12″ | -3.1% |
| 265/70R20 | 34.61 | -1.10″ | -3.1% |
| 315/60R20 | 34.88 | -0.83″ | -2.3% |
| 35×11.50R20 | 35.00 | -0.71″ | -2.0% |
| 35×12.50R20 | 35.00 | -0.71″ | -2.0% |
| 35×13.50R20 | 35.00 | -0.71″ | -2.0% |
| 35×15.50R20 | 35.00 | -0.71″ | -2.0% |
| 295/65R20 | 35.10 | -0.61″ | -1.7% |
| 325/60R20 | 35.35 | -0.35″ | -1.0% |
| 36×15.50R20 | 36.00 | +0.29″ | +0.8% |
How to read 285/70R20
Marks a light truck (LT) tire.
A percentage, not a measurement: the sidewall is 70% as tall as the tire is wide, which is 199.5 mm or 7.85 inches.
Radial construction.
Mounts on a 20-inch wheel. Approved wheel widths run 7.5″ to 9.5″.
Each tire carries up to 3,970 lb (1,800 kg) on its own, or 3,640 lb (1,650 kg) each when paired on a dual rear axle.
Rated for up to 112 mph sustained.
Printed separately as "LOAD RANGE E": a 10-ply rating, inflated up to 80 psi (standard load-range table). The load range E tires here carry up to 3,970 lb each, as published.
| Specification | Inches | Metric |
|---|---|---|
| Overall diameter | 35.71 | 907 mm |
| Section width | 11.22 | 285 mm |
| Sidewall height | 7.85 | 199.5 mm |
| Circumference | 112.2 | 2,849 mm |
| Revolutions per mile (calculated, unloaded) | 564.8 | 351 per km |
| Revolutions per mile (published by manufacturers) | 581 | 361 per km |
| Approved wheel width | 7.5–9.5 | 191–241 mm |
Speedometer error after switching to 285/70R20
Questions about 285/70R20
What is 285/70R20 in inches?
35.71 inches tall, 11.22 inches wide, on a 20-inch wheel. Written in inches, that is roughly 35.7×11.2R20.
What wheel width do I need for 285/70R20?
Manufacturers approve 7.5–9.5″ wide wheels for this size.
How many revolutions per mile does a 285/70R20 make?
Published figures run 581 revolutions per mile. The calculated figure is 564.8, but manufacturers measure the tire under load, where it rolls on a smaller radius.
How much taller is 285/70R20 than 325/60R20?
0.35 inches taller on paper (35.71″ vs 35.35″), which raises the axle about 0.18″. Your speedometer will read about 1.0% slow.