Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 345/30-20 | 280/35-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.15 (715) | 27.72 (704) | -0.43 (-11) -1.5% |
| Width inches (mm) | 13.58 (345) | 11.02 (280) | -2.56 (-65) -18.8% |
| Circum. inches (mm) | 88.43 (2246.24) | 87.07 (2211.68) | -1.36 (-34.56) -1.5% |
| Sidewall Height inches (mm) | 4.07 (103.5) | 3.86 (98) | -0.22 (-5.5) -5.3% |
| Revolutions per mile (km) | 716.46 (445.19) | 727.66 (452.14) | 11.19 (6.96) 1.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.69 mph (31.69 km/h) |
| 25 mph (40.23 km/h) | 24.62 mph (39.61 km/h) |
| 30 mph (48.28 km/h) | 29.54 mph (47.54 km/h) |
| 35 mph (56.33 km/h) | 34.46 mph (55.46 km/h) |
| 40 mph (64.37 km/h) | 39.38 mph (63.38 km/h) |
| 45 mph (72.42 km/h) | 44.31 mph (71.31 km/h) |
| 50 mph (80.47 km/h) | 49.23 mph (79.23 km/h) |
| 55 mph (88.51 km/h) | 54.15 mph (87.15 km/h) |
| 60 mph (96.56 km/h) | 59.08 mph (95.08 km/h) |
| 65 mph (104.61 km/h) | 64 mph (103 km/h) |
| 70 mph (112.65 km/h) | 68.92 mph (110.92 km/h) |
| 75 mph (120.7 km/h) | 73.85 mph (118.84 km/h) |
| 80 mph (128.75 km/h) | 78.77 mph (126.77 km/h) |
| 85 mph (136.79 km/h) | 83.69 mph (134.69 km/h) |
| 90 mph (144.84 km/h) | 88.62 mph (142.61 km/h) |
| 95 mph (152.89 km/h) | 93.54 mph (150.54 km/h) |
| 100 mph (160.93 km/h) | 98.46 mph (158.46 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1852 | 2151 | 2317 | 2419 | 2529 | 2608 | 2695 | 2797 | 2939 | 3081 | 3239 | 3365 | 3593 | 3845 | 4042 | 4168 | 4239 | 4499 | 4862 | 5650 |
Better Fuel Economy Factory Ratios Increased Power
