tireheight.com265/45R21 in inches
A 265/45R21 tire is 30.4″ tall and 10.4″ wide, and fits a 21″ wheel. In inches it is written 30.4×10.4R21.
How tall 265/45R21 tires really are
Heights published by Michelin and Toyo for all 11 tires in this size. Their published revolutions per mile work out to 29.4–29.5″ under load (below).
Real 265/45R21 tires measure 30.30–30.40″, against 30.39″ from the size code. They run both taller and shorter than the size code.
Published revs per mile (684–685) mean the tire rolls like a 29.4–29.5″ tire on the vehicle. Use this for speedometer calibration.
The lightest (Michelin CrossClimate2, XL) is 5.5 lb lighter per corner than the heaviest (Michelin Latitude Tour HP, SL).
11 tires in 265/45R21
Sort by the spec you care about.
| Load | Revs/mi | Source | |||||
|---|---|---|---|---|---|---|---|
| Michelin CrossClimate2All-season | XL · 108V | 30.30 | 32.6 | 10.0 | 2,205 | 685 | Spec page |
| Michelin Pilot Sport All-Season 4Performance | XL · 108Y | 30.40 | 32.6 | 10.0 | 2,205 | 685 | Spec page |
| Michelin Primacy Tour A/STouring | XL · 108Y | 30.40 | 33.0 | 10.0 | 2,205 | 685 | Spec page |
| Toyo Proxes Sport 2Performance | XL · 108Y | 30.40 | 33.7 | 9.2 | 2,205 | 684 | Spec page |
| Michelin Latitude Tour HPAll-season | SL · 104W | 30.30 | 34.4 | 9.0 | 1,804 | 685 | Spec page |
| Michelin Primacy Tour A/STouring | XL · 108V | 30.40 | 34.9 | 8.5 | 2,205 | 685 | Spec page |
| Michelin X-Ice Snow+Winter | XL · 108H | 30.35 | 35.0 | 10.5 | 2,205 | 685 | Spec page |
| Michelin Primacy Tour A/STouring | XL · 108V | 30.40 | 35.2 | 10.0 | 2,205 | 685 | Spec page |
| Michelin X-Ice SnowWinter | XL · 108T | 30.35 | 35.3 | 10.5 | 2,205 | 685 | Spec page |
| Toyo Observe G3-IceWinter | SL · 104T | 30.35 | 36.2 | 12.0 | 1,984 | 684 | Spec page |
| Michelin Latitude Tour HPAll-season | SL · 104W | 30.30 | 38.1 | 9.0 | 1,804 | 685 | Spec page |
Is 265/45R21 a 30-inch tire?
Close. The size code works out to 30.39″, and the 11 tires here publish 30.30–30.40″, 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 265/45R21
A percentage, not a measurement: the sidewall is 45% as tall as the tire is wide, which is 119.3 mm or 4.69 inches.
Radial construction.
Mounts on a 21-inch wheel. Approved wheel widths run 8.5″ to 10.0″.
Each tire carries up to 2,205 lb (1,000 kg) at its maximum pressure.
Rated for up to 149 mph sustained.
Printed after the size. In this size the XL tires carry up to 2,205 lb each and the standard-load tires up to 1,984 lb, as published.
| Specification | Inches | Metric |
|---|---|---|
| Overall diameter | 30.39 | 772 mm |
| Section width | 10.43 | 265 mm |
| Sidewall height | 4.69 | 119.3 mm |
| Circumference | 95.5 | 2,425 mm |
| Revolutions per mile (calculated, unloaded) | 663.6 | 412 per km |
| Revolutions per mile (published by manufacturers) | 684–685 | 425–426 per km |
| Approved wheel width | 8.5–10.0 | 216–254 mm |
Speedometer error after switching to 265/45R21
Questions about 265/45R21
What is 265/45R21 in inches?
30.39 inches tall, 10.43 inches wide, on a 21-inch wheel. Written in inches, that is roughly 30.4×10.4R21.
How much does a 265/45R21 tire weigh?
Between 32.6 lb and 38.1 lb for the 11 tires listed here. The lightest is the Michelin CrossClimate2 (XL); the heaviest is the Michelin Latitude Tour HP (SL).
What wheel width do I need for 265/45R21?
Manufacturers approve 8.5–10.0″ wide wheels for this size.
How many revolutions per mile does a 265/45R21 make?
Published figures run 684–685 revolutions per mile. The calculated figure is 663.6, but manufacturers measure the tire under load, where it rolls on a smaller radius.
How much taller is 265/45R21 than 295/40R21?
0.10 inches taller on paper (30.39″ vs 30.29″), which raises the axle about 0.05″. Your speedometer will read about 0.3% slow.