Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 345/30-20 | 375/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.15 (715) | 31.81 (808) | 3.66 (93) 13% |
| Width inches (mm) | 13.58 (345) | 14.76 (375) | 1.18 (30) 8.7% |
| Circum. inches (mm) | 88.43 (2246.24) | 99.94 (2538.41) | 11.5 (292.17) 13% |
| Sidewall Height inches (mm) | 4.07 (103.5) | 5.91 (150) | 1.83 (46.5) 44.9% |
| Revolutions per mile (km) | 716.46 (445.19) | 634 (393.95) | -82.46 (-51.24) -11.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.6 mph (36.37 km/h) |
| 25 mph (40.23 km/h) | 28.25 mph (45.47 km/h) |
| 30 mph (48.28 km/h) | 33.9 mph (54.56 km/h) |
| 35 mph (56.33 km/h) | 39.55 mph (63.65 km/h) |
| 40 mph (64.37 km/h) | 45.2 mph (72.75 km/h) |
| 45 mph (72.42 km/h) | 50.85 mph (81.84 km/h) |
| 50 mph (80.47 km/h) | 56.5 mph (90.93 km/h) |
| 55 mph (88.51 km/h) | 62.15 mph (100.03 km/h) |
| 60 mph (96.56 km/h) | 67.8 mph (109.12 km/h) |
| 65 mph (104.61 km/h) | 73.45 mph (118.21 km/h) |
| 70 mph (112.65 km/h) | 79.1 mph (127.31 km/h) |
| 75 mph (120.7 km/h) | 84.76 mph (136.4 km/h) |
| 80 mph (128.75 km/h) | 90.41 mph (145.49 km/h) |
| 85 mph (136.79 km/h) | 96.06 mph (154.59 km/h) |
| 90 mph (144.84 km/h) | 101.71 mph (163.68 km/h) |
| 95 mph (152.89 km/h) | 107.36 mph (172.77 km/h) |
| 100 mph (160.93 km/h) | 113.01 mph (181.87 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1613 | 1874 | 2018 | 2108 | 2204 | 2272 | 2348 | 2437 | 2561 | 2684 | 2822 | 2932 | 3131 | 3350 | 3522 | 3632 | 3694 | 3920 | 4236 | 4923 |
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