# 185/65R15 tire size in inches

- **Diameter:** 24.5 in
- **Width:** 7.3 in
- **Sidewall:** 4.73 in
- **Revs per mile:** 824

## Quick answer

A 185/65R15 tire is **24.5 inches** (622 mm) tall and **7.3 inches** (185 mm) wide, with a 4.73-inch sidewall, and fits a 15-inch wheel. In inch sizing that is roughly 24.5x7.3R15.

## 185/65R15 dimensions

| Measurement | Inches | Millimeters |
| --- | --- | --- |
| Overall diameter | 24.5 in | 622 mm |
| Section width | 7.3 in | 185 mm |
| Sidewall height | 4.73 in | 120.3 mm |
| Rim diameter | 15 in | 381 mm |
| Circumference | 76.9 in | 1952 mm |
| Revolutions per mile | 824 | -- |

## What does 185/65R15 mean?

| Part | Value | Meaning |
| --- | --- | --- |
| Width | 185 | The tire is 185 mm wide from sidewall to sidewall. |
| Aspect ratio | 65 | The sidewall is 65% as tall as the tire is wide (120.3 mm). |
| R | R | Radial construction (nearly every modern tire). |
| Rim | 15 | Fits a 15-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 185/65R15?

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 |
| --- | --- | --- | --- |
| [215/45R17](/tools/tire-size/215-45r17) | 24.6 in | +0.6% | 60.4 mph actual |
| [195/60R15](/tools/tire-size/195-60r15) | 24.2 in | -1.0% | 59.4 mph actual |
| [205/55R16](/tools/tire-size/205-55r16) | 24.9 in | +1.7% | 61.0 mph actual |
| [225/45R17](/tools/tire-size/225-45r17) | 25.0 in | +2.1% | 61.2 mph actual |
| [195/65R15](/tools/tire-size/195-65r15) | 25.0 in | +2.1% | 61.3 mph actual |
| [225/40R18](/tools/tire-size/225-40r18) | 25.1 in | +2.5% | 61.5 mph actual |

## Frequently asked questions

### How tall is a 185/65R15 tire?

A 185/65R15 tire is 24.5 inches (622 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 185/65R15 tires on my car?

Only if your door-jamb placard or owner's manual lists 185/65R15, or a plus-size alternative within about 3% of the original diameter that clears the suspension. The wheel must be 15 inches in diameter and the right width for a 185 mm tire.

### How many revolutions per mile does a 185/65R15 tire make?

About 824 revolutions per mile, calculated from its 76.9-inch circumference. Manufacturers' published figures are usually slightly higher because a loaded tire squats a little.

## Other 15-inch sizes

- [195/60R15](https://diagxcar.com/tools/tire-size/195-60r15)
- [195/65R15](https://diagxcar.com/tools/tire-size/195-65r15)

## 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/185-65r15
General information, not a substitute for a qualified mechanic.