# 305mm tire section width

## What does 305mm mean in a tire size?

A 305mm section width tire is 305 millimetres wide at its widest point when unmounted. Common sizes include 305/50R17 and more. Recommended rim width varies by aspect ratio.

- [305/40 R20](https://tirefitlab.com/305-40-r20.md)
- [305/40 R22](https://tirefitlab.com/305-40-r22.md)
- [305/45 R22](https://tirefitlab.com/305-45-r22.md)

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Methodology: https://tirefitlab.com/methodology/