Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/30-20 | 285/35-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.2 (691) | 27.85 (707.5) | 0.65 (16.5) 2.4% |
| Width inches (mm) | 12.01 (305) | 11.22 (285) | -0.79 (-20) -6.6% |
| Circum. inches (mm) | 85.47 (2170.84) | 87.51 (2222.68) | 2.04 (51.84) 2.4% |
| Sidewall Height inches (mm) | 3.6 (91.5) | 3.93 (99.75) | 0.32 (8.25) 9% |
| Revolutions per mile (km) | 741.35 (460.65) | 724.06 (449.91) | -17.29 (-10.74) -2.3% |
285/35-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.48 mph (32.96 km/h) |
| 25 mph (40.23 km/h) | 25.6 mph (41.19 km/h) |
| 30 mph (48.28 km/h) | 30.72 mph (49.43 km/h) |
| 35 mph (56.33 km/h) | 35.84 mph (57.67 km/h) |
| 40 mph (64.37 km/h) | 40.96 mph (65.91 km/h) |
| 45 mph (72.42 km/h) | 46.07 mph (74.15 km/h) |
| 50 mph (80.47 km/h) | 51.19 mph (82.39 km/h) |
| 55 mph (88.51 km/h) | 56.31 mph (90.63 km/h) |
| 60 mph (96.56 km/h) | 61.43 mph (98.87 km/h) |
| 65 mph (104.61 km/h) | 66.55 mph (107.11 km/h) |
| 70 mph (112.65 km/h) | 71.67 mph (115.34 km/h) |
| 75 mph (120.7 km/h) | 76.79 mph (123.58 km/h) |
| 80 mph (128.75 km/h) | 81.91 mph (131.82 km/h) |
| 85 mph (136.79 km/h) | 87.03 mph (140.06 km/h) |
| 90 mph (144.84 km/h) | 92.15 mph (148.3 km/h) |
| 95 mph (152.89 km/h) | 97.27 mph (156.54 km/h) |
| 100 mph (160.93 km/h) | 102.39 mph (164.78 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
