Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/60-20 | 285/65-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 34.88 (886) | 34.59 (878.5) | -0.3 (-7.5) -0.8% |
| Width inches (mm) | 12.4 (315) | 11.22 (285) | -1.18 (-30) -9.5% |
| Circum. inches (mm) | 109.58 (2783.45) | 108.66 (2759.89) | -0.93 (-23.56) -0.8% |
| Sidewall Height inches (mm) | 7.44 (189) | 7.29 (185.25) | -0.15 (-3.75) -2% |
| Revolutions per mile (km) | 578.18 (359.27) | 583.12 (362.33) | 4.94 (3.07) 0.9% |
285/65-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.83 mph (31.91 km/h) |
| 25 mph (40.23 km/h) | 24.79 mph (39.89 km/h) |
| 30 mph (48.28 km/h) | 29.75 mph (47.87 km/h) |
| 35 mph (56.33 km/h) | 34.7 mph (55.85 km/h) |
| 40 mph (64.37 km/h) | 39.66 mph (63.83 km/h) |
| 45 mph (72.42 km/h) | 44.62 mph (71.81 km/h) |
| 50 mph (80.47 km/h) | 49.58 mph (79.79 km/h) |
| 55 mph (88.51 km/h) | 54.53 mph (87.76 km/h) |
| 60 mph (96.56 km/h) | 59.49 mph (95.74 km/h) |
| 65 mph (104.61 km/h) | 64.45 mph (103.72 km/h) |
| 70 mph (112.65 km/h) | 69.41 mph (111.7 km/h) |
| 75 mph (120.7 km/h) | 74.37 mph (119.68 km/h) |
| 80 mph (128.75 km/h) | 79.32 mph (127.66 km/h) |
| 85 mph (136.79 km/h) | 84.28 mph (135.64 km/h) |
| 90 mph (144.84 km/h) | 89.24 mph (143.62 km/h) |
| 95 mph (152.89 km/h) | 94.2 mph (151.59 km/h) |
| 100 mph (160.93 km/h) | 99.15 mph (159.57 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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