Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/60-18 | 285/65-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.46 (799.2) | 34.59 (878.5) | 3.12 (79.3) 9.9% |
| Width inches (mm) | 11.22 (285) | 11.22 (285) | 0 (0) 0% |
| Circum. inches (mm) | 98.85 (2510.76) | 108.66 (2759.89) | 9.81 (249.13) 9.9% |
| Sidewall Height inches (mm) | 6.73 (171) | 7.29 (185.25) | 0.56 (14.25) 8.3% |
| Revolutions per mile (km) | 640.98 (398.28) | 583.12 (362.33) | -57.86 (-35.95) -9% |
285/65-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.98 mph (35.38 km/h) |
| 25 mph (40.23 km/h) | 27.48 mph (44.23 km/h) |
| 30 mph (48.28 km/h) | 32.98 mph (53.07 km/h) |
| 35 mph (56.33 km/h) | 38.47 mph (61.92 km/h) |
| 40 mph (64.37 km/h) | 43.97 mph (70.76 km/h) |
| 45 mph (72.42 km/h) | 49.47 mph (79.61 km/h) |
| 50 mph (80.47 km/h) | 54.96 mph (88.45 km/h) |
| 55 mph (88.51 km/h) | 60.46 mph (97.3 km/h) |
| 60 mph (96.56 km/h) | 65.95 mph (106.14 km/h) |
| 65 mph (104.61 km/h) | 71.45 mph (114.99 km/h) |
| 70 mph (112.65 km/h) | 76.95 mph (123.83 km/h) |
| 75 mph (120.7 km/h) | 82.44 mph (132.68 km/h) |
| 80 mph (128.75 km/h) | 87.94 mph (141.52 km/h) |
| 85 mph (136.79 km/h) | 93.43 mph (150.37 km/h) |
| 90 mph (144.84 km/h) | 98.93 mph (159.21 km/h) |
| 95 mph (152.89 km/h) | 104.43 mph (168.06 km/h) |
| 100 mph (160.93 km/h) | 109.92 mph (176.9 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1484 | 1724 | 1856 | 1939 | 2027 | 2090 | 2160 | 2242 | 2355 | 2469 | 2595 | 2696 | 2879 | 3082 | 3239 | 3340 | 3397 | 3606 | 3896 | 4528 |
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