# 285/65 R18

## What size is 285/65 R18?

285/65 R18 has an overall diameter of about 32.59 in, a section width of 11.22 in and a sidewall height of 7.29 in. It turns roughly 619 times per mile. Below are the exact figures plus in-tolerance plus/minus sizes you can switch to safely.

## Specification

| Specification | |
|---|---|
| Overall diameter | 32.59 in |
| Section width | 11.22 in |
| Sidewall height | 7.29 in |
| Circumference | 102.37 in |
| Revolutions | 385 /km · 619 /mi |

## In-tolerance sizes

| Size | Diameter | Speedo | Verdict |
|---|---|---|---|
| [305/45 R22](https://tirefitlab.com/305-45-r22.md) | +0.7% | +0.7% | ✓ OK |
| [33x12.50 R15](https://tirefitlab.com/33x12.50-r15.md) | +1.3% | +1.3% | ✓ OK |
| [33x12.50 R16](https://tirefitlab.com/33x12.50-r16.md) | +1.3% | +1.3% | ✓ OK |
| [33x12.50 R18](https://tirefitlab.com/33x12.50-r18.md) | +1.3% | +1.3% | ✓ OK |
| [285/45 R22](https://tirefitlab.com/285-45-r22.md) | -1.5% | -1.5% | ✓ OK |
| [275/65 R18](https://tirefitlab.com/275-65-r18.md) | -1.6% | -1.6% | ✓ OK |
| [275/70 R18](https://tirefitlab.com/275-70-r18.md) | +1.8% | +1.8% | ✓ OK |
| [275/55 R20](https://tirefitlab.com/275-55-r20.md) | -2.1% | -2.1% | ✓ OK |
| [275/45 R22](https://tirefitlab.com/275-45-r22.md) | -2.6% | -2.6% | ✓ OK |

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Methodology: https://tirefitlab.com/methodology/ · Tire size calculator: https://tirefitlab.com/285-65-r18/

> Geometry is computed in canonical millimetres and is deterministic across the site. Always verify physical clearance before fitting.