Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/40-19 | 345/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.92 (734.6) | 28.15 (715) | -0.77 (-19.6) -2.7% |
| Width inches (mm) | 12.4 (315) | 13.58 (345) | 1.18 (30) 9.5% |
| Circum. inches (mm) | 90.86 (2307.81) | 88.43 (2246.24) | -2.42 (-61.58) -2.7% |
| Sidewall Height inches (mm) | 4.96 (126) | 4.07 (103.5) | -0.89 (-22.5) -17.9% |
| Revolutions per mile (km) | 697.35 (433.31) | 716.46 (445.19) | 19.12 (11.88) 2.7% |
345/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.47 mph (31.33 km/h) |
| 25 mph (40.23 km/h) | 24.33 mph (39.16 km/h) |
| 30 mph (48.28 km/h) | 29.2 mph (46.99 km/h) |
| 35 mph (56.33 km/h) | 34.07 mph (54.82 km/h) |
| 40 mph (64.37 km/h) | 38.93 mph (62.66 km/h) |
| 45 mph (72.42 km/h) | 43.8 mph (70.49 km/h) |
| 50 mph (80.47 km/h) | 48.67 mph (78.32 km/h) |
| 55 mph (88.51 km/h) | 53.53 mph (86.15 km/h) |
| 60 mph (96.56 km/h) | 58.4 mph (93.98 km/h) |
| 65 mph (104.61 km/h) | 63.27 mph (101.82 km/h) |
| 70 mph (112.65 km/h) | 68.13 mph (109.65 km/h) |
| 75 mph (120.7 km/h) | 73 mph (117.48 km/h) |
| 80 mph (128.75 km/h) | 77.87 mph (125.31 km/h) |
| 85 mph (136.79 km/h) | 82.73 mph (133.14 km/h) |
| 90 mph (144.84 km/h) | 87.6 mph (140.98 km/h) |
| 95 mph (152.89 km/h) | 92.47 mph (148.81 km/h) |
| 100 mph (160.93 km/h) | 97.33 mph (156.64 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1823 | 2118 | 2281 | 2382 | 2490 | 2568 | 2653 | 2754 | 2894 | 3034 | 3189 | 3313 | 3538 | 3786 | 3980 | 4104 | 4174 | 4430 | 4787 | 5563 |
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