Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 395/85-20 | 40/13.5-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 46.44 (1179.5) | 39.96 (1014.9) | -6.48 (-164.6) -14% |
| Width inches (mm) | 15.55 (395) | 13.5 (343) | -2.05 (-52) -13.2% |
| Circum. inches (mm) | 145.89 (3705.51) | 125.53 (3188.4) | -20.36 (-517.11) -14% |
| Sidewall Height inches (mm) | 13.22 (335.75) | 11.48 (291.55) | -1.74 (-44.2) -13.2% |
| Revolutions per mile (km) | 434.31 (269.87) | 504.75 (313.64) | 70.44 (43.77) 16.2% |
40/13.5-17 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.21 mph (27.7 km/h) |
| 25 mph (40.23 km/h) | 21.51 mph (34.62 km/h) |
| 30 mph (48.28 km/h) | 25.81 mph (41.54 km/h) |
| 35 mph (56.33 km/h) | 30.12 mph (48.47 km/h) |
| 40 mph (64.37 km/h) | 34.42 mph (55.39 km/h) |
| 45 mph (72.42 km/h) | 38.72 mph (62.31 km/h) |
| 50 mph (80.47 km/h) | 43.02 mph (69.24 km/h) |
| 55 mph (88.51 km/h) | 47.32 mph (76.16 km/h) |
| 60 mph (96.56 km/h) | 51.63 mph (83.09 km/h) |
| 65 mph (104.61 km/h) | 55.93 mph (90.01 km/h) |
| 70 mph (112.65 km/h) | 60.23 mph (96.93 km/h) |
| 75 mph (120.7 km/h) | 64.53 mph (103.86 km/h) |
| 80 mph (128.75 km/h) | 68.84 mph (110.78 km/h) |
| 85 mph (136.79 km/h) | 73.14 mph (117.7 km/h) |
| 90 mph (144.84 km/h) | 77.44 mph (124.63 km/h) |
| 95 mph (152.89 km/h) | 81.74 mph (131.55 km/h) |
| 100 mph (160.93 km/h) | 86.04 mph (138.48 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1284 | 1492 | 1607 | 1678 | 1755 | 1809 | 1869 | 1940 | 2039 | 2137 | 2246 | 2334 | 2492 | 2667 | 2804 | 2891 | 2941 | 3121 | 3372 | 3919 |
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