255/55R18 is a tire size notation. It describes geometry but does not establish the load, speed, tire class, wheel approval or fit of a particular replacement.
As an Amazon Associate I earn from qualifying purchases.
How to read this size
- Nominal width: 255 mm
- Aspect ratio: 55 %
- Wheel diameter: 18.0 in
- Calculated nominal diameter: 737.7 mm
Calculated nominal diameter is an arithmetic estimate from the size code; actual product measurements vary.
Before ordering tires
Read the driver-door tire placard. Match the installed wheel, axle, tire class, load index, speed rating and any OE marking. The size alone cannot approve a replacement SKU. Tire-sidewall maximum pressure is not your vehicle’s cold inflation pressure.
Vehicles recorded with this size
| Model year and vehicle | Trim / option | Axle | Service |
|---|---|---|---|
| 2009 Saab 9-7X | 4.2i | unspecified | Not documented |
| 2009 Saab 9-7X | 5.3i | unspecified | Not documented |
| 2014 Subaru Tribeca | Limited | unspecified | Not documented |
| 2017 Volkswagen Touareg | V6 Sport | unspecified | Not documented |
Exact product variants in research
No source-backed rows are available for this exact selection.
Explore 255/55R18 tires on Amazon
Amazon search results may mix tire classes, load and speed ratings, OE markings and package quantities. Match the full requirement on your actual vehicle before ordering.
(paid link)
Search 255/55R18 tires on AmazonCompare sizes with the tire size calculator. It is an educational geometry comparison, not a fitment ruling.
Sources and scope
- Goodyear — Find 2014 Subaru Tribeca Tires | Goodyear (checked 2026-11-01)
- Goodyear — Find 2017 Volkswagen Touareg Tires | Goodyear (checked 2026-11-01)
- Goodyear — Find 2009 Saab 9-7X Tires | Goodyear (checked 2026-11-01)
Research checked November 2, 2026. A source-observed size is not final product fitment. Confirm the actual vehicle and current manufacturer guidance.