# 33x12.50 R18

## What size is 33x12.50 R18?

33x12.50 R18 has an overall diameter of about 33.00 in, a section width of 12.50 in and a sidewall height of 7.50 in. It turns roughly 611 times per mile. Below are the exact figures plus in-tolerance plus/minus sizes you can switch to safely.

## Specification

| Specification | |
|---|---|
| Overall diameter | 33.00 in |
| Section width | 12.50 in |
| Sidewall height | 7.50 in |
| Circumference | 103.67 in |
| Revolutions | 380 /km · 611 /mi |

## In-tolerance sizes

| Size | Diameter | Speedo | Verdict |
|---|---|---|---|
| [33x12.50 R15](https://tirefitlab.com/33x12.50-r15.md) | +0.0% | +0.0% | ✓ OK |
| [33x12.50 R16](https://tirefitlab.com/33x12.50-r16.md) | +0.0% | +0.0% | ✓ OK |
| [275/70 R18](https://tirefitlab.com/275-70-r18.md) | +0.5% | +0.5% | ✓ OK |
| [305/45 R22](https://tirefitlab.com/305-45-r22.md) | -0.6% | -0.6% | ✓ OK |
| [285/65 R18](https://tirefitlab.com/285-65-r18.md) | -1.3% | -1.3% | ✓ OK |
| [285/45 R22](https://tirefitlab.com/285-45-r22.md) | -2.7% | -2.7% | ✓ OK |
| [275/65 R18](https://tirefitlab.com/275-65-r18.md) | -2.8% | -2.8% | ✓ OK |

---

Methodology: https://tirefitlab.com/methodology/ · Tire size calculator: https://tirefitlab.com/33x12.50-r18/

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