Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 345/30-20 | 285/35-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.15 (715) | 27.85 (707.5) | -0.3 (-7.5) -1% |
| Width inches (mm) | 13.58 (345) | 11.22 (285) | -2.36 (-60) -17.4% |
| Circum. inches (mm) | 88.43 (2246.24) | 87.51 (2222.68) | -0.93 (-23.56) -1% |
| Sidewall Height inches (mm) | 4.07 (103.5) | 3.93 (99.75) | -0.15 (-3.75) -3.6% |
| Revolutions per mile (km) | 716.46 (445.19) | 724.06 (449.91) | 7.6 (4.72) 1.1% |
285/35-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.79 mph (31.85 km/h) |
| 25 mph (40.23 km/h) | 24.74 mph (39.81 km/h) |
| 30 mph (48.28 km/h) | 29.69 mph (47.77 km/h) |
| 35 mph (56.33 km/h) | 34.63 mph (55.74 km/h) |
| 40 mph (64.37 km/h) | 39.58 mph (63.7 km/h) |
| 45 mph (72.42 km/h) | 44.53 mph (71.66 km/h) |
| 50 mph (80.47 km/h) | 49.48 mph (79.62 km/h) |
| 55 mph (88.51 km/h) | 54.42 mph (87.59 km/h) |
| 60 mph (96.56 km/h) | 59.37 mph (95.55 km/h) |
| 65 mph (104.61 km/h) | 64.32 mph (103.51 km/h) |
| 70 mph (112.65 km/h) | 69.27 mph (111.47 km/h) |
| 75 mph (120.7 km/h) | 74.21 mph (119.43 km/h) |
| 80 mph (128.75 km/h) | 79.16 mph (127.4 km/h) |
| 85 mph (136.79 km/h) | 84.11 mph (135.36 km/h) |
| 90 mph (144.84 km/h) | 89.06 mph (143.32 km/h) |
| 95 mph (152.89 km/h) | 94 mph (151.28 km/h) |
| 100 mph (160.93 km/h) | 98.95 mph (159.25 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1843 | 2141 | 2305 | 2407 | 2517 | 2595 | 2682 | 2783 | 2925 | 3066 | 3223 | 3348 | 3575 | 3826 | 4022 | 4148 | 4218 | 4477 | 4838 | 5622 |
Better Fuel Economy Factory Ratios Increased Power
