# 275/55R20 tire size in inches

- **Diameter:** 31.9 in
- **Width:** 10.8 in
- **Sidewall:** 5.95 in
- **Revs per mile:** 632

## Quick answer

A 275/55R20 tire is **31.9 inches** (811 mm) tall and **10.8 inches** (275 mm) wide, with a 5.95-inch sidewall, and fits a 20-inch wheel. In inch sizing that is roughly 31.9x10.8R20.

## 275/55R20 dimensions

| Measurement | Inches | Millimeters |
| --- | --- | --- |
| Overall diameter | 31.9 in | 811 mm |
| Section width | 10.8 in | 275 mm |
| Sidewall height | 5.95 in | 151.3 mm |
| Rim diameter | 20 in | 508 mm |
| Circumference | 100.2 in | 2546 mm |
| Revolutions per mile | 632 | -- |

## What does 275/55R20 mean?

| Part | Value | Meaning |
| --- | --- | --- |
| Width | 275 | The tire is 275 mm wide from sidewall to sidewall. |
| Aspect ratio | 55 | The sidewall is 55% as tall as the tire is wide (151.3 mm). |
| R | R | Radial construction (nearly every modern tire). |
| Rim | 20 | Fits a 20-inch wheel. |

The load index and speed rating that follow the size (for example "98H") are on the sidewall and in your door-jamb sticker. See the [load index chart](/tools/tire-load-index-chart) and [speed rating chart](/tools/tire-speed-rating-chart).

## What sizes can replace 275/55R20?

Sizes within 3% of the overall diameter, the usual limit for keeping the speedometer, ABS and stability control accurate. Check the width fits your wheel and fender, and match the load index.

| Size | Diameter | Difference | Speedometer at 60 mph |
| --- | --- | --- | --- |
| [275/65R18](/tools/tire-size/275-65r18) | 32.1 in | +0.5% | 60.3 mph actual |
| [285/45R22](/tools/tire-size/285-45r22) | 32.1 in | +0.6% | 60.4 mph actual |
| [265/75R16](/tools/tire-size/265-75r16) | 31.6 in | -0.8% | 59.5 mph actual |
| [265/70R17](/tools/tire-size/265-70r17) | 31.6 in | -1.0% | 59.4 mph actual |
| [265/65R18](/tools/tire-size/265-65r18) | 31.6 in | -1.1% | 59.3 mph actual |
| [285/70R17](/tools/tire-size/285-70r17) | 32.7 in | +2.5% | 61.5 mph actual |
| [255/70R17](/tools/tire-size/255-70r17) | 31.1 in | -2.7% | 58.4 mph actual |
| [275/50R22](/tools/tire-size/275-50r22) | 32.8 in | +2.9% | 61.7 mph actual |

## Frequently asked questions

### How tall is a 275/55R20 tire?

A 275/55R20 tire is 31.9 inches (811 mm) tall when new and correctly inflated. Real tires vary by a few tenths of an inch between brands and tread patterns.

### Can I put 275/55R20 tires on my car?

Only if your door-jamb placard or owner's manual lists 275/55R20, or a plus-size alternative within about 3% of the original diameter that clears the suspension. The wheel must be 20 inches in diameter and the right width for a 275 mm tire.

### How many revolutions per mile does a 275/55R20 tire make?

About 632 revolutions per mile, calculated from its 100.2-inch circumference. Manufacturers' published figures are usually slightly higher because a loaded tire squats a little.

## Other 20-inch sizes

- [255/50R20](https://diagxcar.com/tools/tire-size/255-50r20)
- [265/50R20](https://diagxcar.com/tools/tire-size/265-50r20)
- [275/40R20](https://diagxcar.com/tools/tire-size/275-40r20)
- [275/60R20](https://diagxcar.com/tools/tire-size/275-60r20)

## Tire tools

- [Tire size calculator](https://diagxcar.com/tools/tire-size-calculator)
- [Tire size decoder](https://diagxcar.com/tools/tire-size-decoder)
- [Load index chart](https://diagxcar.com/tools/tire-load-index-chart)
- [Speed rating chart](https://diagxcar.com/tools/tire-speed-rating-chart)

## Tire care

- [How long do tires last?](https://diagxcar.com/how-long/tires)
- [How often to rotate tires](https://diagxcar.com/how-often/rotate-tires)
- [Uneven tire wear](https://diagxcar.com/symptoms/uneven-tire-wear)

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Source page: https://diagxcar.com/tools/tire-size/275-55r20
General information, not a substitute for a qualified mechanic.