Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/45-21 | 285/35-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.1 (789.9) | 28.85 (732.9) | -2.24 (-57) -7.2% |
| Width inches (mm) | 11.22 (285) | 11.22 (285) | 0 (0) 0% |
| Circum. inches (mm) | 97.7 (2481.54) | 90.65 (2302.47) | -7.05 (-179.07) -7.2% |
| Sidewall Height inches (mm) | 5.05 (128.25) | 3.93 (99.75) | -1.12 (-28.5) -22.2% |
| Revolutions per mile (km) | 648.53 (402.97) | 698.96 (434.31) | 50.44 (31.34) 7.8% |
285/35-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.56 mph (29.86 km/h) |
| 25 mph (40.23 km/h) | 23.2 mph (37.33 km/h) |
| 30 mph (48.28 km/h) | 27.84 mph (44.8 km/h) |
| 35 mph (56.33 km/h) | 32.47 mph (52.26 km/h) |
| 40 mph (64.37 km/h) | 37.11 mph (59.73 km/h) |
| 45 mph (72.42 km/h) | 41.75 mph (67.19 km/h) |
| 50 mph (80.47 km/h) | 46.39 mph (74.66 km/h) |
| 55 mph (88.51 km/h) | 51.03 mph (82.13 km/h) |
| 60 mph (96.56 km/h) | 55.67 mph (89.59 km/h) |
| 65 mph (104.61 km/h) | 60.31 mph (97.06 km/h) |
| 70 mph (112.65 km/h) | 64.95 mph (104.53 km/h) |
| 75 mph (120.7 km/h) | 69.59 mph (111.99 km/h) |
| 80 mph (128.75 km/h) | 74.23 mph (119.46 km/h) |
| 85 mph (136.79 km/h) | 78.87 mph (126.92 km/h) |
| 90 mph (144.84 km/h) | 83.51 mph (134.39 km/h) |
| 95 mph (152.89 km/h) | 88.14 mph (141.86 km/h) |
| 100 mph (160.93 km/h) | 92.78 mph (149.32 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
