tireheight.com285/60R18 in inches
A 285/60R18 tire is 31.5″ tall and 11.2″ wide, and fits a 18″ wheel. In inches it is written 31.5×11.2R18.
How tall 285/60R18 tires really are
Heights published by BFGoodrich, General, Michelin and Toyo for all 9 tires in this size. Their published revolutions per mile work out to 30.5–30.6″ under load (below).
Real 285/60R18 tires measure 31.46–31.50″, against 31.46″ from the size code. They run both taller and shorter than the size code.
Published revs per mile (660–661) mean the tire rolls like a 30.5–30.6″ tire on the vehicle. Use this for speedometer calibration.
The lightest (Toyo Proxes ST III, XL) is 15.7 lb lighter per corner than the heaviest (BFGoodrich All-Terrain T/A KO3, LT D).
9 tires in 285/60R18
Sort by the spec you care about.
| Load | Revs/mi | Source | |||||
|---|---|---|---|---|---|---|---|
| Toyo Proxes ST IIIPerformance | XL · 120V | 31.46 | 41.0 | 10.2 | 3,086 | 660 | Spec page |
| Michelin Defender LTX M/S 2All-season | XL · 120H | 31.50 | 43.2 | 11.0 | 3,086 | 661 | Spec page |
| Toyo Open Country H/T IIHighway | XL · 120V | 31.46 | 43.3 | 11.5 | 3,086 | 660 | Spec page |
| Toyo Open Country A/T IIIAll-terrain | XL · 120S | 31.46 | 43.5 | 13.6 | 3,086 | 660 | Spec page |
| BFGoodrich Trail-Terrain T/AAll-terrain | SL · 116H | 31.50 | 44.9 | 12.5 | 2,756 | 661 | Spec page |
| BFGoodrich Trail-Terrain T/A+ | SL · 116H | 31.50 | 45.5 | 12.5 | 2,756 | 661 | Spec page |
| Toyo Observe G3-IceWinter | XL · 120T | 31.46 | 46.5 | 13.7 | 3,086 | 660 | Spec page |
| General Grabber A/TXAll-terrain | LT E · 122S | 31.50 | 52.5 | 16.0 | 3,305 | 660 | Spec page |
| BFGoodrich All-Terrain T/A KO3All-terrain | LT D · 118S | 31.50 | 56.7 | 15.0 | 2,910 | 661 | Spec page |
Is 285/60R18 a 31-inch tire?
Close. The size code works out to 31.46″, and the 9 tires here publish 31.46–31.50″, so people call it a 31.
All 31-inch tire sizes, on every wheel size.
Compare with nearby sizes
Differences in overall diameter, calculated from each size code.
How to read 285/60R18
A percentage, not a measurement: the sidewall is 60% as tall as the tire is wide, which is 171.0 mm or 6.73 inches.
Radial construction.
Mounts on a 18-inch wheel. Approved wheel widths run 8.0″ to 10.0″.
Each tire carries up to 2,756 lb (1,250 kg) at its maximum pressure.
Rated for up to 130 mph sustained.
| Specification | Inches | Metric |
|---|---|---|
| Overall diameter | 31.46 | 799 mm |
| Section width | 11.22 | 285 mm |
| Sidewall height | 6.73 | 171.0 mm |
| Circumference | 98.8 | 2,511 mm |
| Revolutions per mile (calculated, unloaded) | 641.0 | 398 per km |
| Revolutions per mile (published by manufacturers) | 660–661 | 410–411 per km |
| Approved wheel width | 8.0–10.0 | 203–254 mm |
Speedometer error after switching to 285/60R18
Questions about 285/60R18
What is 285/60R18 in inches?
31.46 inches tall, 11.22 inches wide, on a 18-inch wheel. Written in inches, that is roughly 31.5×11.2R18.
How much does a 285/60R18 tire weigh?
Between 41.0 lb and 56.7 lb for the 9 tires listed here. The lightest is the Toyo Proxes ST III (XL); the heaviest is the BFGoodrich All-Terrain T/A KO3 (LT D).
What wheel width do I need for 285/60R18?
Manufacturers approve 8.0–10.0″ wide wheels for this size.
How many revolutions per mile does a 285/60R18 make?
Published figures run 660–661 revolutions per mile. The calculated figure is 641.0, but manufacturers measure the tire under load, where it rolls on a smaller radius.
What is the difference between P285/60R18 and LT285/60R18?
Passenger tires (7 here) are built for passenger loads, with max loads of 2756–3086 lb. Light-truck tires (2 here) come in heavier load ranges with max loads of 2910–3305 lb, and are usually heavier with deeper tread.
How much taller is 285/60R18 than 255/65R18?
0.41 inches taller on paper (31.46″ vs 31.05″), which raises the axle about 0.21″. Your speedometer will read about 1.3% slow.