Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 345/30-20 | 365/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.15 (715) | 31.5 (800) | 3.35 (85) 11.9% |
| Width inches (mm) | 13.58 (345) | 14.37 (365) | 0.79 (20) 5.8% |
| Circum. inches (mm) | 88.43 (2246.24) | 98.95 (2513.27) | 10.51 (267.04) 11.9% |
| Sidewall Height inches (mm) | 4.07 (103.5) | 5.75 (146) | 1.67 (42.5) 41.1% |
| Revolutions per mile (km) | 716.46 (445.19) | 640.34 (397.89) | -76.12 (-47.3) -10.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.38 mph (36.01 km/h) |
| 25 mph (40.23 km/h) | 27.97 mph (45.02 km/h) |
| 30 mph (48.28 km/h) | 33.57 mph (54.02 km/h) |
| 35 mph (56.33 km/h) | 39.16 mph (63.02 km/h) |
| 40 mph (64.37 km/h) | 44.76 mph (72.03 km/h) |
| 45 mph (72.42 km/h) | 50.35 mph (81.03 km/h) |
| 50 mph (80.47 km/h) | 55.94 mph (90.03 km/h) |
| 55 mph (88.51 km/h) | 61.54 mph (99.04 km/h) |
| 60 mph (96.56 km/h) | 67.13 mph (108.04 km/h) |
| 65 mph (104.61 km/h) | 72.73 mph (117.04 km/h) |
| 70 mph (112.65 km/h) | 78.32 mph (126.05 km/h) |
| 75 mph (120.7 km/h) | 83.92 mph (135.05 km/h) |
| 80 mph (128.75 km/h) | 89.51 mph (144.05 km/h) |
| 85 mph (136.79 km/h) | 95.1 mph (153.06 km/h) |
| 90 mph (144.84 km/h) | 100.7 mph (162.06 km/h) |
| 95 mph (152.89 km/h) | 106.29 mph (171.06 km/h) |
| 100 mph (160.93 km/h) | 111.89 mph (180.07 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1630 | 1893 | 2039 | 2129 | 2226 | 2295 | 2371 | 2462 | 2586 | 2711 | 2850 | 2961 | 3162 | 3384 | 3557 | 3668 | 3731 | 3959 | 4278 | 4972 |
Better Fuel Economy Factory Ratios Increased Power
