Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/30-21 | 285/35-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.68 (728.4) | 28.85 (732.9) | 0.18 (4.5) 0.6% |
| Width inches (mm) | 12.8 (325) | 11.22 (285) | -1.57 (-40) -12.3% |
| Circum. inches (mm) | 90.09 (2288.34) | 90.65 (2302.47) | 0.56 (14.14) 0.6% |
| Sidewall Height inches (mm) | 3.84 (97.5) | 3.93 (99.75) | 0.09 (2.25) 2.3% |
| Revolutions per mile (km) | 703.28 (437) | 698.96 (434.31) | -4.32 (-2.68) -0.6% |
285/35-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.12 mph (32.39 km/h) |
| 25 mph (40.23 km/h) | 25.15 mph (40.48 km/h) |
| 30 mph (48.28 km/h) | 30.19 mph (48.58 km/h) |
| 35 mph (56.33 km/h) | 35.22 mph (56.68 km/h) |
| 40 mph (64.37 km/h) | 40.25 mph (64.77 km/h) |
| 45 mph (72.42 km/h) | 45.28 mph (72.87 km/h) |
| 50 mph (80.47 km/h) | 50.31 mph (80.96 km/h) |
| 55 mph (88.51 km/h) | 55.34 mph (89.06 km/h) |
| 60 mph (96.56 km/h) | 60.37 mph (97.16 km/h) |
| 65 mph (104.61 km/h) | 65.4 mph (105.25 km/h) |
| 70 mph (112.65 km/h) | 70.43 mph (113.35 km/h) |
| 75 mph (120.7 km/h) | 75.46 mph (121.45 km/h) |
| 80 mph (128.75 km/h) | 80.49 mph (129.54 km/h) |
| 85 mph (136.79 km/h) | 85.53 mph (137.64 km/h) |
| 90 mph (144.84 km/h) | 90.56 mph (145.74 km/h) |
| 95 mph (152.89 km/h) | 95.59 mph (153.83 km/h) |
| 100 mph (160.93 km/h) | 100.62 mph (161.93 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1779 | 2066 | 2225 | 2324 | 2430 | 2505 | 2589 | 2687 | 2823 | 2960 | 3111 | 3232 | 3451 | 3694 | 3883 | 4004 | 4072 | 4322 | 4670 | 5427 |
Better Fuel Economy Factory Ratios Increased Power
