Data sheet TS-21 · Index
Tire sizes
This section covers 38 tire sizes grouped by rim diameter, with nominal overall diameter and width shown for each size. Use the size list and comparisons to compare dimensions before checking vehicle-specific requirements.
Jump to a rim
15″ rims
Table 1
Size comparisons
Two sizes side by side: diameter, sidewall, speedometer and clearance.
- 275/55R20 vs 275/60R20 +3.4%
- 275/60R20 vs 275/65R20 +3.3%
- 265/70R17 vs 285/70R17 +3.5%
- 275/65R18 vs 275/70R18 +3.4%
- 265/70R16 vs 265/75R16 +3.4%
- 265/75R16 vs 285/75R16 +3.7%
- 295/70R17 vs 285/70R17 −1.7%
- 245/75R17 vs 265/70R17 +0.4%
- 265/65R17 vs 265/70R17 +3.4%
- 245/75R16 vs 265/75R16 +3.9%
- 275/65R20 vs 285/65R20 +1.5%
- 275/70R18 vs 285/70R18 +1.7%
- 285/65R18 vs 275/70R18 +1.8%
All 239 sizes we know, with inches and millimeters: tire size chart.
§ 1
How are size pages organized and checked?
The size list groups pages by rim diameter: 15 in, 16 in, 17 in, 18 in, 20 in and 22 in. Each entry shows nominal overall diameter and width by the formula. The tire size chart helps you read dimensions across sizes. Use the comparisons list or tire size comparison to examine changes between sizes.
Each size page requires at least 5 tires from at least 3 brands in tire makers' size tables. All 38 pages met that check on October 15, 2026. Published measurements come from official size tables from Nitto, Toyo, Kumho, Mickey Thompson and Firestone. Nominal dimensions are unloaded calculations; actual tires measure slightly differently.
Related
Calculators and size classes
- Tire size calculatorTwo sizes: diameter, sidewall, revs and speedometer.
- Compare up to 4 sizesUp to four sizes side by side, drawn to scale.
- Metric ↔ inchesMetric to inches, and 33x12.50R20 to metric.
- Speedometer errorTrue speed after a size change.
- Gear ratio and RPMEngine RPM and the ratio to regear to.
- Wheel offset and pokeBackspacing, poke and inner clearance.
- DOT date codeHow old a tire is, from the DOT number.
- Load index chartLoad index in pounds and kilograms.
- Bolt patternMeasure it, convert inches to mm.
- Rim size and tire fitWhat 17x8 ET35 means, which sizes go on it.
- What fits my carStart from the placard on the door.
- Tire size chartCommon sizes in inches, by rim.