255/70R18 Tire Size in Inches
A 255/70R18 tire is about 32.1 inches tall and 10.04 inches wide, with a 7.03-inch sidewall, fitted to a 18-inch wheel.
Source: manufacturer documents (listed below) · Updated 2026-11-05 · By CarWhere Research
Calculated nominal dimensions; circumference 100.7 in. Measured size varies slightly by tire model and rim width.
Vehicles with factory 255/70R18 tires
| Vehicle | Trim | Years |
|---|---|---|
| Toyota Tundra | Type A | 2020, 2021[1],[2] |
Compared with nearby sizes
| Size | Diameter | Difference |
|---|---|---|
| 255/70R18 | 32.1 in | — |
| 255/65R18 | 31.1 in | -3.1% |
| 255/75R18 | 33.1 in | +3.1% |
Width in inches
Check the exact vehicle, not just the model
Trim, package and production changes all move these numbers. Decode the 17-character VIN with the free VIN decoder to confirm the engine and trim, or see the federal engine and MPG specs. Shopping? Browse live inventory and what buyers actually paid.
Frequently asked questions
How tall is a 255/70R18 tire in inches?
About 32.1 inches: a 18-inch wheel plus two 7.03-inch sidewalls (255 × 70% = 178.5 mm each).
How wide is a 255/70R18 tire?
10.04 inches of section width (255 mm ÷ 25.4).
What vehicles come with 255/70R18 tires?
In our manufacturer-sourced data: Toyota Tundra — trims and years are in the table above.
Sources
- Toyota Motor Sales, U.S.A., Inc., Toyota 2020 Tundra Owner's Manual (OM0C025U), 8-1. Specifications, Tires and wheels (accessed 2026-11-05).
- Toyota Motor Sales, U.S.A., Inc., Toyota 2021 Tundra Owner's Manual (OM0C039U), 8-1. Specifications, Tires and wheels (accessed 2026-11-05).