Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/60-20 | 255/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.85 (682) | 28.03 (712) | 1.18 (30) 4.4% |
| Width inches (mm) | 5.71 (145) | 10.04 (255) | 4.33 (110) 75.9% |
| Circum. inches (mm) | 84.35 (2142.57) | 88.06 (2236.81) | 3.71 (94.25) 4.4% |
| Sidewall Height inches (mm) | 3.43 (87) | 4.02 (102) | 0.59 (15) 17.2% |
| Revolutions per mile (km) | 751.13 (466.73) | 719.48 (447.06) | -31.65 (-19.67) -4.2% |
255/40-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.88 mph (33.6 km/h) |
| 25 mph (40.23 km/h) | 26.1 mph (42 km/h) |
| 30 mph (48.28 km/h) | 31.32 mph (50.4 km/h) |
| 35 mph (56.33 km/h) | 36.54 mph (58.8 km/h) |
| 40 mph (64.37 km/h) | 41.76 mph (67.21 km/h) |
| 45 mph (72.42 km/h) | 46.98 mph (75.61 km/h) |
| 50 mph (80.47 km/h) | 52.2 mph (84.01 km/h) |
| 55 mph (88.51 km/h) | 57.42 mph (92.41 km/h) |
| 60 mph (96.56 km/h) | 62.64 mph (100.81 km/h) |
| 65 mph (104.61 km/h) | 67.86 mph (109.21 km/h) |
| 70 mph (112.65 km/h) | 73.08 mph (117.61 km/h) |
| 75 mph (120.7 km/h) | 78.3 mph (126.01 km/h) |
| 80 mph (128.75 km/h) | 83.52 mph (134.41 km/h) |
| 85 mph (136.79 km/h) | 88.74 mph (142.81 km/h) |
| 90 mph (144.84 km/h) | 93.96 mph (151.21 km/h) |
| 95 mph (152.89 km/h) | 99.18 mph (159.61 km/h) |
| 100 mph (160.93 km/h) | 104.4 mph (168.01 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1831 | 2127 | 2291 | 2392 | 2501 | 2579 | 2665 | 2766 | 2906 | 3046 | 3202 | 3327 | 3553 | 3802 | 3997 | 4122 | 4192 | 4449 | 4807 | 5586 |
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