# 265/65R18 tire size in inches

- **Diameter:** 31.6 in
- **Width:** 10.4 in
- **Sidewall:** 6.78 in
- **Revs per mile:** 639

## Quick answer

A 265/65R18 tire is **31.6 inches** (802 mm) tall and **10.4 inches** (265 mm) wide, with a 6.78-inch sidewall, and fits a 18-inch wheel. In inch sizing that is roughly 31.6x10.4R18.

## 265/65R18 dimensions

| Measurement | Inches | Millimeters |
| --- | --- | --- |
| Overall diameter | 31.6 in | 802 mm |
| Section width | 10.4 in | 265 mm |
| Sidewall height | 6.78 in | 172.3 mm |
| Rim diameter | 18 in | 457 mm |
| Circumference | 99.2 in | 2519 mm |
| Revolutions per mile | 639 | -- |

## What does 265/65R18 mean?

| Part | Value | Meaning |
| --- | --- | --- |
| Width | 265 | The tire is 265 mm wide from sidewall to sidewall. |
| Aspect ratio | 65 | The sidewall is 65% as tall as the tire is wide (172.3 mm). |
| R | R | Radial construction (nearly every modern tire). |
| Rim | 18 | Fits a 18-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 265/65R18?

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 |
| --- | --- | --- | --- |
| [265/70R17](/tools/tire-size/265-70r17) | 31.6 in | +0.1% | 60.1 mph actual |
| [265/75R16](/tools/tire-size/265-75r16) | 31.6 in | +0.3% | 60.2 mph actual |
| [275/55R20](/tools/tire-size/275-55r20) | 31.9 in | +1.1% | 60.7 mph actual |
| [255/70R17](/tools/tire-size/255-70r17) | 31.1 in | -1.6% | 59.0 mph actual |
| [275/65R18](/tools/tire-size/275-65r18) | 32.1 in | +1.6% | 61.0 mph actual |
| [285/45R22](/tools/tire-size/285-45r22) | 32.1 in | +1.7% | 61.0 mph actual |

## Frequently asked questions

### How tall is a 265/65R18 tire?

A 265/65R18 tire is 31.6 inches (802 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 265/65R18 tires on my car?

Only if your door-jamb placard or owner's manual lists 265/65R18, or a plus-size alternative within about 3% of the original diameter that clears the suspension. The wheel must be 18 inches in diameter and the right width for a 265 mm tire.

### How many revolutions per mile does a 265/65R18 tire make?

About 639 revolutions per mile, calculated from its 99.2-inch circumference. Manufacturers' published figures are usually slightly higher because a loaded tire squats a little.

## Other 18-inch sizes

- [225/40R18](https://diagxcar.com/tools/tire-size/225-40r18)
- [225/55R18](https://diagxcar.com/tools/tire-size/225-55r18)
- [225/60R18](https://diagxcar.com/tools/tire-size/225-60r18)
- [235/45R18](https://diagxcar.com/tools/tire-size/235-45r18)
- [235/50R18](https://diagxcar.com/tools/tire-size/235-50r18)
- [235/55R18](https://diagxcar.com/tools/tire-size/235-55r18)
- [235/60R18](https://diagxcar.com/tools/tire-size/235-60r18)
- [245/45R18](https://diagxcar.com/tools/tire-size/245-45r18)
- [245/60R18](https://diagxcar.com/tools/tire-size/245-60r18)
- [255/55R18](https://diagxcar.com/tools/tire-size/255-55r18)
- [265/60R18](https://diagxcar.com/tools/tire-size/265-60r18)
- [275/65R18](https://diagxcar.com/tools/tire-size/275-65r18)
- [275/70R18](https://diagxcar.com/tools/tire-size/275-70r18)

## 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/265-65r18
General information, not a substitute for a qualified mechanic.