/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.
Popular sizes
- 185/55 R15
- 195/55 R15
- 195/55 R16
- 205/55 R16
- 215/55 R16
- 225/55 R16
- 205/55 R17
- 215/55 R17
- 225/55 R17
- 235/55 R17
- 225/55 R18
- 235/55 R18
- 255/55 R18
- 235/55 R19
- 275/55 R19
- 275/55 R20
Full aspect ratio guide · Tire section width guide · Tire size calculator
Seasonal check
Planning a long summer drive?
Use the budget and running-cost tools before a trip, especially if the current tires are worn or the replacement size changes diameter.
- Technical check
- 2026-06-28
- Content updated
- 2026-06-21
What changed
- Checked generated routes, metadata, sitemap inclusion and localized page rendering.