/45 series tire aspect ratio
What does /45 mean in a tire size?
A /45 aspect ratio means the tire sidewall height is 45% of the section width. For a 205/45R16 tire, the sidewall is 92.25mm tall. Common 45-series sizes span multiple rim diameters.
Popular sizes
- 205/45 R17
- 215/45 R17
- 225/45 R17
- 235/45 R17
- 245/45 R17
- 225/45 R18
- 235/45 R18
- 245/45 R18
- 255/45 R18
- 245/45 R19
- 255/45 R19
- 275/45 R19
- 285/45 R19
- 245/45 R20
- 255/45 R20
- 265/45 R20
- 275/45 R20
- 265/45 R21
- 275/45 R21
- 275/45 R22
- 285/45 R22
- 305/45 R22
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.