Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 345/30-20 | 355/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.15 (715) | 31.18 (792) | 3.03 (77) 10.8% |
| Width inches (mm) | 13.58 (345) | 13.98 (355) | 0.39 (10) 2.9% |
| Circum. inches (mm) | 88.43 (2246.24) | 97.96 (2488.14) | 9.52 (241.9) 10.8% |
| Sidewall Height inches (mm) | 4.07 (103.5) | 5.59 (142) | 1.52 (38.5) 37.2% |
| Revolutions per mile (km) | 716.46 (445.19) | 646.81 (401.91) | -69.66 (-43.28) -9.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.15 mph (35.65 km/h) |
| 25 mph (40.23 km/h) | 27.69 mph (44.57 km/h) |
| 30 mph (48.28 km/h) | 33.23 mph (53.48 km/h) |
| 35 mph (56.33 km/h) | 38.77 mph (62.39 km/h) |
| 40 mph (64.37 km/h) | 44.31 mph (71.31 km/h) |
| 45 mph (72.42 km/h) | 49.85 mph (80.22 km/h) |
| 50 mph (80.47 km/h) | 55.38 mph (89.13 km/h) |
| 55 mph (88.51 km/h) | 60.92 mph (98.05 km/h) |
| 60 mph (96.56 km/h) | 66.46 mph (106.96 km/h) |
| 65 mph (104.61 km/h) | 72 mph (115.87 km/h) |
| 70 mph (112.65 km/h) | 77.54 mph (124.79 km/h) |
| 75 mph (120.7 km/h) | 83.08 mph (133.7 km/h) |
| 80 mph (128.75 km/h) | 88.62 mph (142.61 km/h) |
| 85 mph (136.79 km/h) | 94.15 mph (151.53 km/h) |
| 90 mph (144.84 km/h) | 99.69 mph (160.44 km/h) |
| 95 mph (152.89 km/h) | 105.23 mph (169.35 km/h) |
| 100 mph (160.93 km/h) | 110.77 mph (178.27 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1646 | 1912 | 2059 | 2150 | 2248 | 2318 | 2395 | 2487 | 2613 | 2739 | 2879 | 2991 | 3194 | 3418 | 3593 | 3705 | 3768 | 3999 | 4322 | 5022 |
Better Fuel Economy Factory Ratios Increased Power
