Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/60-20 | 285/65-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 34.41 (874) | 34.59 (878.5) | 0.18 (4.5) 0.5% |
| Width inches (mm) | 12.01 (305) | 11.22 (285) | -0.79 (-20) -6.6% |
| Circum. inches (mm) | 108.1 (2745.75) | 108.66 (2759.89) | 0.56 (14.14) 0.5% |
| Sidewall Height inches (mm) | 7.2 (183) | 7.29 (185.25) | 0.09 (2.25) 1.2% |
| Revolutions per mile (km) | 586.12 (364.2) | 583.12 (362.33) | -3 (-1.87) -0.5% |
285/65-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.1 mph (32.35 km/h) |
| 25 mph (40.23 km/h) | 25.13 mph (40.44 km/h) |
| 30 mph (48.28 km/h) | 30.15 mph (48.53 km/h) |
| 35 mph (56.33 km/h) | 35.18 mph (56.62 km/h) |
| 40 mph (64.37 km/h) | 40.21 mph (64.71 km/h) |
| 45 mph (72.42 km/h) | 45.23 mph (72.79 km/h) |
| 50 mph (80.47 km/h) | 50.26 mph (80.88 km/h) |
| 55 mph (88.51 km/h) | 55.28 mph (88.97 km/h) |
| 60 mph (96.56 km/h) | 60.31 mph (97.06 km/h) |
| 65 mph (104.61 km/h) | 65.33 mph (105.15 km/h) |
| 70 mph (112.65 km/h) | 70.36 mph (113.23 km/h) |
| 75 mph (120.7 km/h) | 75.39 mph (121.32 km/h) |
| 80 mph (128.75 km/h) | 80.41 mph (129.41 km/h) |
| 85 mph (136.79 km/h) | 85.44 mph (137.5 km/h) |
| 90 mph (144.84 km/h) | 90.46 mph (145.59 km/h) |
| 95 mph (152.89 km/h) | 95.49 mph (153.68 km/h) |
| 100 mph (160.93 km/h) | 100.51 mph (161.76 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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