Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 345/30-20 | 345/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.15 (715) | 30.87 (784) | 2.72 (69) 9.7% |
| Width inches (mm) | 13.58 (345) | 13.58 (345) | 0 (0) 0% |
| Circum. inches (mm) | 88.43 (2246.24) | 96.97 (2463.01) | 8.53 (216.77) 9.7% |
| Sidewall Height inches (mm) | 4.07 (103.5) | 5.43 (138) | 1.36 (34.5) 33.3% |
| Revolutions per mile (km) | 716.46 (445.19) | 653.41 (406.01) | -63.06 (-39.18) -8.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.93 mph (35.29 km/h) |
| 25 mph (40.23 km/h) | 27.41 mph (44.12 km/h) |
| 30 mph (48.28 km/h) | 32.9 mph (52.94 km/h) |
| 35 mph (56.33 km/h) | 38.38 mph (61.76 km/h) |
| 40 mph (64.37 km/h) | 43.86 mph (70.59 km/h) |
| 45 mph (72.42 km/h) | 49.34 mph (79.41 km/h) |
| 50 mph (80.47 km/h) | 54.83 mph (88.23 km/h) |
| 55 mph (88.51 km/h) | 60.31 mph (97.06 km/h) |
| 60 mph (96.56 km/h) | 65.79 mph (105.88 km/h) |
| 65 mph (104.61 km/h) | 71.27 mph (114.7 km/h) |
| 70 mph (112.65 km/h) | 76.76 mph (123.53 km/h) |
| 75 mph (120.7 km/h) | 82.24 mph (132.35 km/h) |
| 80 mph (128.75 km/h) | 87.72 mph (141.17 km/h) |
| 85 mph (136.79 km/h) | 93.2 mph (150 km/h) |
| 90 mph (144.84 km/h) | 98.69 mph (158.82 km/h) |
| 95 mph (152.89 km/h) | 104.17 mph (167.64 km/h) |
| 100 mph (160.93 km/h) | 109.65 mph (176.47 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1663 | 1932 | 2080 | 2172 | 2271 | 2342 | 2420 | 2512 | 2639 | 2767 | 2908 | 3021 | 3227 | 3453 | 3630 | 3743 | 3807 | 4040 | 4366 | 5073 |
Better Fuel Economy Factory Ratios Increased Power
