tireheight.com285/45R20 in inches
A 285/45R20 tire is 30.1″ tall and 11.2″ wide, and fits a 20″ wheel. In inches it is written 30.1×11.2R20.
How tall 285/45R20 tires really are
Heights published by Michelin and Toyo for all 10 tires in this size. Their published revolutions per mile work out to 29.2″ under load (below).
Real 285/45R20 tires measure 30.08–30.10″, against 30.10″ from the size code. They run both taller and shorter than the size code.
Published revs per mile (691) mean the tire rolls like a 29.2″ tire on the vehicle. Use this for speedometer calibration.
The lightest (Michelin Pilot Sport All-Season 4, XL) is 5.6 lb lighter per corner than the heaviest (Toyo OPEN COUNTRY Q/T, XL).
10 tires in 285/45R20
Sort by the spec you care about.
| Load | Revs/mi | Source | |||||
|---|---|---|---|---|---|---|---|
| Michelin Pilot Sport All-Season 4Performance | XL · 112Y | 30.10 | 32.6 | 10.0 | 2,469 | 691 | Spec page |
| Michelin CrossClimate2All-season | XL · 112V | 30.10 | 32.7 | 10.0 | 2,469 | 691 | Spec page |
| Michelin Pilot Sport EVPerformance | XL · 112W | 30.10 | 32.9 | 8.0 | 2,469 | 691 | Spec page |
| Michelin Pilot Alpin 5Winter | XL · 112V | 30.08 | 33.7 | 10.5 | 2,469 | 691 | Spec page |
| Michelin Pilot Sport EVPerformance | XL · 112Y | 30.10 | 33.7 | 8.5 | 2,469 | 691 | Spec page |
| Michelin Pilot Sport All-Season 4Performance | XL · 112V | 30.10 | 34.0 | 9.0 | 2,469 | 691 | Spec page |
| Michelin Pilot Sport 4 SUVPerformance | XL · 112Y | 30.10 | 34.2 | 9.5 | 2,469 | 691 | Spec page |
| Michelin X-Ice Snow+Winter | XL · 112H | 30.08 | 36.8 | 10.5 | 2,469 | 691 | Spec page |
| Michelin X-Ice SnowWinter | XL · 112H | 30.08 | 37.3 | 10.5 | 2,469 | 691 | Spec page |
| Toyo OPEN COUNTRY Q/TAll-season | XL · 112H | 30.08 | 38.2 | 12.5 | 2,469 | 691 | Spec page |
Is 285/45R20 a 30-inch tire?
Yes. The size code works out to 30.10″, and the 10 tires here publish 30.08–30.10″, so people call it a 30.
All 30-inch tire sizes, on every wheel size.
Compare with nearby sizes
Differences in overall diameter, calculated from each size code.
How to read 285/45R20
A percentage, not a measurement: the sidewall is 45% as tall as the tire is wide, which is 128.3 mm or 5.05 inches.
Radial construction.
Mounts on a 20-inch wheel. Approved wheel widths run 9.0″ to 10.5″.
Each tire carries up to 2,469 lb (1,120 kg) at its maximum pressure.
Rated for up to 149 mph sustained.
Printed after the size.
| Specification | Inches | Metric |
|---|---|---|
| Overall diameter | 30.10 | 764 mm |
| Section width | 11.22 | 285 mm |
| Sidewall height | 5.05 | 128.3 mm |
| Circumference | 94.6 | 2,402 mm |
| Revolutions per mile (calculated, unloaded) | 670.1 | 416 per km |
| Revolutions per mile (published by manufacturers) | 691 | 429 per km |
| Approved wheel width | 9.0–10.5 | 229–267 mm |
Speedometer error after switching to 285/45R20
Questions about 285/45R20
What is 285/45R20 in inches?
30.10 inches tall, 11.22 inches wide, on a 20-inch wheel. Written in inches, that is roughly 30.1×11.2R20.
How much does a 285/45R20 tire weigh?
Between 32.6 lb and 38.2 lb for the 10 tires listed here. The lightest is the Michelin Pilot Sport All-Season 4 (XL); the heaviest is the Toyo OPEN COUNTRY Q/T (XL).
What wheel width do I need for 285/45R20?
Manufacturers approve 9.0–10.5″ wide wheels for this size.
How many revolutions per mile does a 285/45R20 make?
Published figures run 691 revolutions per mile. The calculated figure is 670.1, but manufacturers measure the tire under load, where it rolls on a smaller radius.
How much taller is 285/45R20 than 255/50R20?
0.06 inches taller on paper (30.10″ vs 30.04″), which raises the axle about 0.03″. Your speedometer will read about 0.2% slow.