Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/40-20 | 255/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.72 (704) | 29.04 (737.5) | 1.32 (33.5) 4.8% |
| Width inches (mm) | 9.65 (245) | 10.04 (255) | 0.39 (10) 4.1% |
| Circum. inches (mm) | 87.07 (2211.68) | 91.22 (2316.92) | 4.14 (105.24) 4.8% |
| Sidewall Height inches (mm) | 3.86 (98) | 4.52 (114.75) | 0.66 (16.75) 17.1% |
| Revolutions per mile (km) | 727.66 (452.14) | 694.6 (431.61) | -33.05 (-20.54) -4.5% |
255/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.95 mph (33.72 km/h) |
| 25 mph (40.23 km/h) | 26.19 mph (42.15 km/h) |
| 30 mph (48.28 km/h) | 31.43 mph (50.58 km/h) |
| 35 mph (56.33 km/h) | 36.67 mph (59.01 km/h) |
| 40 mph (64.37 km/h) | 41.9 mph (67.44 km/h) |
| 45 mph (72.42 km/h) | 47.14 mph (75.87 km/h) |
| 50 mph (80.47 km/h) | 52.38 mph (84.3 km/h) |
| 55 mph (88.51 km/h) | 57.62 mph (92.73 km/h) |
| 60 mph (96.56 km/h) | 62.86 mph (101.16 km/h) |
| 65 mph (104.61 km/h) | 68.09 mph (109.59 km/h) |
| 70 mph (112.65 km/h) | 73.33 mph (118.01 km/h) |
| 75 mph (120.7 km/h) | 78.57 mph (126.44 km/h) |
| 80 mph (128.75 km/h) | 83.81 mph (134.87 km/h) |
| 85 mph (136.79 km/h) | 89.04 mph (143.3 km/h) |
| 90 mph (144.84 km/h) | 94.28 mph (151.73 km/h) |
| 95 mph (152.89 km/h) | 99.52 mph (160.16 km/h) |
| 100 mph (160.93 km/h) | 104.76 mph (168.59 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1768 | 2053 | 2211 | 2309 | 2415 | 2490 | 2572 | 2670 | 2806 | 2941 | 3091 | 3212 | 3430 | 3671 | 3859 | 3979 | 4047 | 4295 | 4641 | 5393 |
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