Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 345/30-20 | 365/65-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.15 (715) | 38.68 (982.5) | 10.53 (267.5) 37.4% |
| Width inches (mm) | 13.58 (345) | 14.37 (365) | 0.79 (20) 5.8% |
| Circum. inches (mm) | 88.43 (2246.24) | 121.52 (3086.61) | 33.09 (840.38) 37.4% |
| Sidewall Height inches (mm) | 4.07 (103.5) | 9.34 (237.25) | 5.27 (133.75) 129.2% |
| Revolutions per mile (km) | 716.46 (445.19) | 521.39 (323.98) | -195.07 (-121.21) -27.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 27.48 mph (44.23 km/h) |
| 25 mph (40.23 km/h) | 34.35 mph (55.29 km/h) |
| 30 mph (48.28 km/h) | 41.22 mph (66.34 km/h) |
| 35 mph (56.33 km/h) | 48.09 mph (77.4 km/h) |
| 40 mph (64.37 km/h) | 54.97 mph (88.46 km/h) |
| 45 mph (72.42 km/h) | 61.84 mph (99.52 km/h) |
| 50 mph (80.47 km/h) | 68.71 mph (110.57 km/h) |
| 55 mph (88.51 km/h) | 75.58 mph (121.63 km/h) |
| 60 mph (96.56 km/h) | 82.45 mph (132.69 km/h) |
| 65 mph (104.61 km/h) | 89.32 mph (143.74 km/h) |
| 70 mph (112.65 km/h) | 96.19 mph (154.8 km/h) |
| 75 mph (120.7 km/h) | 103.06 mph (165.86 km/h) |
| 80 mph (128.75 km/h) | 109.93 mph (176.92 km/h) |
| 85 mph (136.79 km/h) | 116.8 mph (187.97 km/h) |
| 90 mph (144.84 km/h) | 123.67 mph (199.03 km/h) |
| 95 mph (152.89 km/h) | 130.54 mph (210.09 km/h) |
| 100 mph (160.93 km/h) | 137.41 mph (221.14 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1327 | 1541 | 1660 | 1733 | 1812 | 1869 | 1931 | 2004 | 2106 | 2208 | 2321 | 2411 | 2575 | 2755 | 2896 | 2987 | 3038 | 3224 | 3484 | 4048 |
Better Fuel Economy Factory Ratios Increased Power
