Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/85-18 | 285/85-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 37.07 (941.7) | 11.04 (280.5) 42.4% |
| Width inches (mm) | 4.72 (120) | 11.22 (285) | 6.5 (165) 137.5% |
| Circum. inches (mm) | 81.78 (2077.22) | 116.47 (2958.44) | 34.69 (881.22) 42.4% |
| Sidewall Height inches (mm) | 4.02 (102) | 9.54 (242.25) | 5.52 (140.25) 137.5% |
| Revolutions per mile (km) | 774.76 (481.41) | 543.98 (338.02) | -230.77 (-143.4) -29.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 28.48 mph (45.84 km/h) |
| 25 mph (40.23 km/h) | 35.61 mph (57.3 km/h) |
| 30 mph (48.28 km/h) | 42.73 mph (68.76 km/h) |
| 35 mph (56.33 km/h) | 49.85 mph (80.22 km/h) |
| 40 mph (64.37 km/h) | 56.97 mph (91.68 km/h) |
| 45 mph (72.42 km/h) | 64.09 mph (103.14 km/h) |
| 50 mph (80.47 km/h) | 71.21 mph (114.6 km/h) |
| 55 mph (88.51 km/h) | 78.33 mph (126.06 km/h) |
| 60 mph (96.56 km/h) | 85.45 mph (137.52 km/h) |
| 65 mph (104.61 km/h) | 92.57 mph (148.99 km/h) |
| 70 mph (112.65 km/h) | 99.7 mph (160.45 km/h) |
| 75 mph (120.7 km/h) | 106.82 mph (171.91 km/h) |
| 80 mph (128.75 km/h) | 113.94 mph (183.37 km/h) |
| 85 mph (136.79 km/h) | 121.06 mph (194.83 km/h) |
| 90 mph (144.84 km/h) | 128.18 mph (206.29 km/h) |
| 95 mph (152.89 km/h) | 135.3 mph (217.75 km/h) |
| 100 mph (160.93 km/h) | 142.42 mph (229.21 km/h) |
| 2.35 | 2.73 | 2.94 | 3.07 | 3.21 | 3.31 | 3.42 | 3.55 | 3.73 | 3.91 | 4.11 | 4.27 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 | 5.71 | 6.17 | 7.17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1384 | 1608 | 1732 | 1808 | 1891 | 1950 | 2015 | 2091 | 2197 | 2303 | 2421 | 2515 | 2686 | 2875 | 3022 | 3116 | 3169 | 3364 | 3635 | 4224 |
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