# /55 series tire aspect ratio

## What does /55 mean in a tire size?

A /55 aspect ratio means the tire sidewall height is 55% of the section width. For a 205/55R16 tire, the sidewall is 112.75mm tall. Common 55-series sizes span multiple rim diameters.

- [185/55 R15](https://tirefitlab.com/185-55-r15.md)
- [195/55 R15](https://tirefitlab.com/195-55-r15.md)
- [195/55 R16](https://tirefitlab.com/195-55-r16.md)
- [205/55 R16](https://tirefitlab.com/205-55-r16.md)
- [215/55 R16](https://tirefitlab.com/215-55-r16.md)
- [225/55 R16](https://tirefitlab.com/225-55-r16.md)
- [205/55 R17](https://tirefitlab.com/205-55-r17.md)
- [215/55 R17](https://tirefitlab.com/215-55-r17.md)
- [225/55 R17](https://tirefitlab.com/225-55-r17.md)
- [235/55 R17](https://tirefitlab.com/235-55-r17.md)
- [225/55 R18](https://tirefitlab.com/225-55-r18.md)
- [235/55 R18](https://tirefitlab.com/235-55-r18.md)
- [255/55 R18](https://tirefitlab.com/255-55-r18.md)
- [235/55 R19](https://tirefitlab.com/235-55-r19.md)
- [275/55 R19](https://tirefitlab.com/275-55-r19.md)
- [275/55 R20](https://tirefitlab.com/275-55-r20.md)

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