tireheight.com235/45R20 in inches
A 235/45R20 tire is 28.3″ tall and 9.3″ wide, and fits a 20″ wheel. In inches it is written 28.3×9.3R20.
How tall 235/45R20 tires really are
Heights published by Michelin and Toyo for all 11 tires in this size. Their published revolutions per mile work out to 27.5″ under load (below).
Real 235/45R20 tires measure 28.30–28.40″, against 28.33″ from the size code. Most run taller than the size code (9 of 11).
Published revs per mile (733–734) mean the tire rolls like a 27.5″ tire on the vehicle. Use this for speedometer calibration.
The lightest (Michelin Pilot Sport EV, XL) is 5.0 lb lighter per corner than the heaviest (Toyo Observe G3-Ice, XL).
11 tires in 235/45R20
Sort by the spec you care about.
| Load | Revs/mi | Source | |||||
|---|---|---|---|---|---|---|---|
| Michelin Pilot Sport EVPerformance | XL · 100H | 28.40 | 24.8 | 8.5 | 1,764 | 734 | Spec page |
| Michelin Pilot Alpin 5Winter | XL · 100H | 28.35 | 25.4 | 9.5 | 1,764 | 734 | Spec page |
| Michelin Pilot Sport 4 SPerformance | XL · 100(Y) | 28.40 | 25.8 | 9.5 | 1,764 | 734 | Spec page |
| Michelin Pilot Sport 5Performance | XL · 100W | 28.40 | 25.8 | 8.5 | 1,764 | 734 | Spec page |
| Michelin Pilot Sport EVPerformance | XL · 100Y | 28.40 | 25.8 | 8.5 | 1,764 | 734 | Spec page |
| Michelin Pilot Sport All-Season 4Performance | XL · 100Y | 28.40 | 26.3 | 10.0 | 1,764 | 734 | Spec page |
| Michelin Pilot Sport 5Performance | XL · 100W | 28.40 | 26.4 | 9.0 | 1,764 | 734 | Spec page |
| Michelin X-Ice SnowWinter | XL · 100H | 28.35 | 28.0 | 10.5 | 1,764 | 734 | Spec page |
| Michelin CrossClimate2All-season | XL · 100H | 28.30 | 28.3 | 10.0 | 1,764 | 734 | Spec page |
| Michelin X-Ice Snow+Winter | XL · 100H | 28.35 | 28.7 | 10.5 | 1,764 | 734 | Spec page |
| Toyo Observe G3-IceWinter | XL · 100T | 28.35 | 29.8 | 12.0 | 1,764 | 733 | Spec page |
Is 235/45R20 a 28-inch tire?
Close. The size code works out to 28.33″, and the 11 tires here publish 28.30–28.40″, so people call it a 28.
All 28-inch tire sizes, on every wheel size.
Compare with nearby sizes
Differences in overall diameter, calculated from each size code.
How to read 235/45R20
A percentage, not a measurement: the sidewall is 45% as tall as the tire is wide, which is 105.8 mm or 4.16 inches.
Radial construction.
Mounts on a 20-inch wheel. Approved wheel widths run 7.5″ to 9.0″.
Each tire carries up to 1,764 lb (800 kg) at its maximum pressure.
Rated for up to 130 mph sustained.
Printed after the size.
| Specification | Inches | Metric |
|---|---|---|
| Overall diameter | 28.33 | 720 mm |
| Section width | 9.25 | 235 mm |
| Sidewall height | 4.16 | 105.8 mm |
| Circumference | 89.0 | 2,260 mm |
| Revolutions per mile (calculated, unloaded) | 712.0 | 442 per km |
| Revolutions per mile (published by manufacturers) | 733–734 | 455–456 per km |
| Approved wheel width | 7.5–9.0 | 191–229 mm |
Speedometer error after switching to 235/45R20
Questions about 235/45R20
What is 235/45R20 in inches?
28.33 inches tall, 9.25 inches wide, on a 20-inch wheel. Written in inches, that is roughly 28.3×9.3R20.
How much does a 235/45R20 tire weigh?
Between 24.8 lb and 29.8 lb for the 11 tires listed here. The lightest is the Michelin Pilot Sport EV (XL); the heaviest is the Toyo Observe G3-Ice (XL).
What wheel width do I need for 235/45R20?
Manufacturers approve 7.5–9.0″ wide wheels for this size.
How many revolutions per mile does a 235/45R20 make?
Published figures run 733–734 revolutions per mile. The calculated figure is 712.0, but manufacturers measure the tire under load, where it rolls on a smaller radius.
How much taller is 235/45R20 than 345/30R20?
0.18 inches taller on paper (28.33″ vs 28.15″), which raises the axle about 0.09″. Your speedometer will read about 0.6% slow.