Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 40/12.5-20 | 405/70-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 40.03 (1016.8) | 42.32 (1075) | 2.29 (58.2) 5.7% |
| Width inches (mm) | 12.52 (318) | 15.94 (405) | 3.43 (87) 27.4% |
| Circum. inches (mm) | 125.76 (3194.37) | 132.96 (3377.21) | 7.2 (182.84) 5.7% |
| Sidewall Height inches (mm) | 10.02 (254.4) | 11.16 (283.5) | 1.15 (29.1) 11.4% |
| Revolutions per mile (km) | 503.81 (313.05) | 476.53 (296.1) | -27.28 (-16.95) -5.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.14 mph (34.03 km/h) |
| 25 mph (40.23 km/h) | 26.43 mph (42.54 km/h) |
| 30 mph (48.28 km/h) | 31.72 mph (51.04 km/h) |
| 35 mph (56.33 km/h) | 37 mph (59.55 km/h) |
| 40 mph (64.37 km/h) | 42.29 mph (68.06 km/h) |
| 45 mph (72.42 km/h) | 47.58 mph (76.57 km/h) |
| 50 mph (80.47 km/h) | 52.86 mph (85.07 km/h) |
| 55 mph (88.51 km/h) | 58.15 mph (93.58 km/h) |
| 60 mph (96.56 km/h) | 63.43 mph (102.09 km/h) |
| 65 mph (104.61 km/h) | 68.72 mph (110.6 km/h) |
| 70 mph (112.65 km/h) | 74.01 mph (119.1 km/h) |
| 75 mph (120.7 km/h) | 79.29 mph (127.61 km/h) |
| 80 mph (128.75 km/h) | 84.58 mph (136.12 km/h) |
| 85 mph (136.79 km/h) | 89.87 mph (144.62 km/h) |
| 90 mph (144.84 km/h) | 95.15 mph (153.13 km/h) |
| 95 mph (152.89 km/h) | 100.44 mph (161.64 km/h) |
| 100 mph (160.93 km/h) | 105.72 mph (170.15 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1213 | 1409 | 1517 | 1584 | 1656 | 1708 | 1765 | 1832 | 1925 | 2018 | 2121 | 2203 | 2353 | 2518 | 2647 | 2730 | 2776 | 2947 | 3184 | 3700 |
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