275/40R20 Tire Size
Dimensions of a 275/40R20 tire in inches and millimeters, with equivalent and plus sizes.
275/40R20 dimensions
A 275/40R20 tire is 275 mm wide with a sidewall that is 40% of the width (110 mm), mounted on a 20-inch rim. Its overall diameter is about 28.66 inches (728 mm), so it is roughly a 28.7-inch tall tire.
| Overall diameter | 28.66 in | 728 mm |
|---|---|---|
| Section width | 10.83 in | 275 mm |
| Sidewall height | 4.33 in | 110.0 mm |
| Rim diameter | 20 in | 508 mm |
| Circumference | 90.0 in | 2287 mm |
| Revolutions | 704 per mile | 437 per km |
Equivalent sizes on a 20-inch rim
These sizes stay within ±3% of the 275/40R20 diameter on the same rim — the range most tire shops use. Not every size is made in every tire model, and only sizes approved for your vehicle (with the right load and speed rating) should be fitted.
| Size | Diameter | mm | Difference |
|---|---|---|---|
| 265/40R20 | 28.35 in | 720 mm | -1.1% |
| 285/40R20 | 28.98 in | 736 mm | +1.1% |
| 255/45R20 | 29.04 in | 738 mm | +1.3% |
| 295/35R20 | 28.13 in | 714 mm | -1.9% |
| 295/40R20 | 29.29 in | 744 mm | +2.2% |
| 255/40R20 | 28.03 in | 712 mm | -2.2% |
| 265/45R20 | 29.39 in | 746 mm | +2.5% |
| 285/35R20 | 27.85 in | 708 mm | -2.8% |
Plus and minus sizes
Changing the rim size? These options on 19-, 21- and 22-inch rims keep the overall diameter within ±3%.
| Size | Diameter | mm | Difference |
|---|---|---|---|
| 305/40R19 | 28.61 in | 727 mm | -0.2% |
| 285/30R22 | 28.73 in | 730 mm | +0.2% |
| 275/45R19 | 28.74 in | 730 mm | +0.3% |
| 275/35R21 | 28.58 in | 726 mm | -0.3% |
| 275/30R22 | 28.50 in | 724 mm | -0.6% |
| 285/35R21 | 28.85 in | 733 mm | +0.7% |
| 265/45R19 | 28.39 in | 721 mm | -0.9% |
| 295/30R22 | 28.97 in | 736 mm | +1.1% |
| 265/35R21 | 28.30 in | 719 mm | -1.3% |
| 295/40R19 | 28.29 in | 719 mm | -1.3% |
Compare 275/40R20 with another size →
Frequently asked questions
How tall is a 275/40R20 tire?
About 28.66 inches (728 mm) in overall diameter.
How wide is a 275/40R20 tire?
The section width is 275 mm, about 10.8 inches.
What size can replace 275/40R20?
On the same rim, 265/40R20 is the closest size (-1.1% diameter). Use only sizes approved for your vehicle.
How many revolutions per mile does a 275/40R20 tire make?
About 704 revolutions per mile (437 per km).
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