Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/60-17 | 285/65-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.41 (797.8) | 34.59 (878.5) | 3.18 (80.7) 10.1% |
| Width inches (mm) | 12.01 (305) | 11.22 (285) | -0.79 (-20) -6.6% |
| Circum. inches (mm) | 98.68 (2506.36) | 108.66 (2759.89) | 9.98 (253.53) 10.1% |
| Sidewall Height inches (mm) | 7.2 (183) | 7.29 (185.25) | 0.09 (2.25) 1.2% |
| Revolutions per mile (km) | 642.1 (398.98) | 583.12 (362.33) | -58.98 (-36.65) -9.2% |
285/65-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.02 mph (35.44 km/h) |
| 25 mph (40.23 km/h) | 27.53 mph (44.3 km/h) |
| 30 mph (48.28 km/h) | 33.03 mph (53.16 km/h) |
| 35 mph (56.33 km/h) | 38.54 mph (62.02 km/h) |
| 40 mph (64.37 km/h) | 44.05 mph (70.89 km/h) |
| 45 mph (72.42 km/h) | 49.55 mph (79.75 km/h) |
| 50 mph (80.47 km/h) | 55.06 mph (88.61 km/h) |
| 55 mph (88.51 km/h) | 60.56 mph (97.47 km/h) |
| 60 mph (96.56 km/h) | 66.07 mph (106.33 km/h) |
| 65 mph (104.61 km/h) | 71.57 mph (115.19 km/h) |
| 70 mph (112.65 km/h) | 77.08 mph (124.05 km/h) |
| 75 mph (120.7 km/h) | 82.59 mph (132.91 km/h) |
| 80 mph (128.75 km/h) | 88.09 mph (141.77 km/h) |
| 85 mph (136.79 km/h) | 93.6 mph (150.63 km/h) |
| 90 mph (144.84 km/h) | 99.1 mph (159.49 km/h) |
| 95 mph (152.89 km/h) | 104.61 mph (168.35 km/h) |
| 100 mph (160.93 km/h) | 110.12 mph (177.21 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1484 | 1724 | 1856 | 1939 | 2027 | 2090 | 2160 | 2242 | 2355 | 2469 | 2595 | 2696 | 2879 | 3082 | 3239 | 3340 | 3397 | 3606 | 3896 | 4528 |
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