Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/80-20 | 285/65-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.32 (948) | 34.59 (878.5) | -2.74 (-69.5) -7.3% |
| Width inches (mm) | 10.83 (275) | 11.22 (285) | 0.39 (10) 3.6% |
| Circum. inches (mm) | 117.25 (2978.23) | 108.66 (2759.89) | -8.6 (-218.34) -7.3% |
| Sidewall Height inches (mm) | 8.66 (220) | 7.29 (185.25) | -1.37 (-34.75) -15.8% |
| Revolutions per mile (km) | 540.37 (335.77) | 583.12 (362.33) | 42.75 (26.56) 7.9% |
285/65-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.53 mph (29.83 km/h) |
| 25 mph (40.23 km/h) | 23.17 mph (37.28 km/h) |
| 30 mph (48.28 km/h) | 27.8 mph (44.74 km/h) |
| 35 mph (56.33 km/h) | 32.43 mph (52.2 km/h) |
| 40 mph (64.37 km/h) | 37.07 mph (59.65 km/h) |
| 45 mph (72.42 km/h) | 41.7 mph (67.11 km/h) |
| 50 mph (80.47 km/h) | 46.33 mph (74.57 km/h) |
| 55 mph (88.51 km/h) | 50.97 mph (82.02 km/h) |
| 60 mph (96.56 km/h) | 55.6 mph (89.48 km/h) |
| 65 mph (104.61 km/h) | 60.23 mph (96.94 km/h) |
| 70 mph (112.65 km/h) | 64.87 mph (104.4 km/h) |
| 75 mph (120.7 km/h) | 69.5 mph (111.85 km/h) |
| 80 mph (128.75 km/h) | 74.14 mph (119.31 km/h) |
| 85 mph (136.79 km/h) | 78.77 mph (126.77 km/h) |
| 90 mph (144.84 km/h) | 83.4 mph (134.22 km/h) |
| 95 mph (152.89 km/h) | 88.04 mph (141.68 km/h) |
| 100 mph (160.93 km/h) | 92.67 mph (149.14 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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