Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 345/30-20 | 365/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.15 (715) | 32.93 (836.5) | 4.78 (121.5) 17% |
| Width inches (mm) | 13.58 (345) | 14.37 (365) | 0.79 (20) 5.8% |
| Circum. inches (mm) | 88.43 (2246.24) | 103.46 (2627.94) | 15.03 (381.7) 17% |
| Sidewall Height inches (mm) | 4.07 (103.5) | 6.47 (164.25) | 2.39 (60.75) 58.7% |
| Revolutions per mile (km) | 716.46 (445.19) | 612.4 (380.53) | -104.06 (-64.66) -14.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.4 mph (37.66 km/h) |
| 25 mph (40.23 km/h) | 29.25 mph (47.07 km/h) |
| 30 mph (48.28 km/h) | 35.1 mph (56.48 km/h) |
| 35 mph (56.33 km/h) | 40.95 mph (65.9 km/h) |
| 40 mph (64.37 km/h) | 46.8 mph (75.31 km/h) |
| 45 mph (72.42 km/h) | 52.65 mph (84.73 km/h) |
| 50 mph (80.47 km/h) | 58.5 mph (94.14 km/h) |
| 55 mph (88.51 km/h) | 64.35 mph (103.56 km/h) |
| 60 mph (96.56 km/h) | 70.2 mph (112.97 km/h) |
| 65 mph (104.61 km/h) | 76.05 mph (122.38 km/h) |
| 70 mph (112.65 km/h) | 81.9 mph (131.8 km/h) |
| 75 mph (120.7 km/h) | 87.74 mph (141.21 km/h) |
| 80 mph (128.75 km/h) | 93.59 mph (150.63 km/h) |
| 85 mph (136.79 km/h) | 99.44 mph (160.04 km/h) |
| 90 mph (144.84 km/h) | 105.29 mph (169.45 km/h) |
| 95 mph (152.89 km/h) | 111.14 mph (178.87 km/h) |
| 100 mph (160.93 km/h) | 116.99 mph (188.28 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1558 | 1810 | 1950 | 2036 | 2129 | 2195 | 2268 | 2354 | 2474 | 2593 | 2726 | 2832 | 3024 | 3236 | 3402 | 3508 | 3568 | 3787 | 4092 | 4755 |
Better Fuel Economy Factory Ratios Increased Power
