Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/30-21 | 285/35-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.5 (698.4) | 28.85 (732.9) | 1.36 (34.5) 4.9% |
| Width inches (mm) | 10.83 (275) | 11.22 (285) | 0.39 (10) 3.6% |
| Circum. inches (mm) | 86.38 (2194.09) | 90.65 (2302.47) | 4.27 (108.38) 4.9% |
| Sidewall Height inches (mm) | 3.25 (82.5) | 3.93 (99.75) | 0.68 (17.25) 20.9% |
| Revolutions per mile (km) | 733.49 (455.77) | 698.96 (434.31) | -34.53 (-21.45) -4.7% |
285/35-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.99 mph (33.78 km/h) |
| 25 mph (40.23 km/h) | 26.23 mph (42.22 km/h) |
| 30 mph (48.28 km/h) | 31.48 mph (50.67 km/h) |
| 35 mph (56.33 km/h) | 36.73 mph (59.11 km/h) |
| 40 mph (64.37 km/h) | 41.98 mph (67.55 km/h) |
| 45 mph (72.42 km/h) | 47.22 mph (76 km/h) |
| 50 mph (80.47 km/h) | 52.47 mph (84.44 km/h) |
| 55 mph (88.51 km/h) | 57.72 mph (92.89 km/h) |
| 60 mph (96.56 km/h) | 62.96 mph (101.33 km/h) |
| 65 mph (104.61 km/h) | 68.21 mph (109.78 km/h) |
| 70 mph (112.65 km/h) | 73.46 mph (118.22 km/h) |
| 75 mph (120.7 km/h) | 78.7 mph (126.66 km/h) |
| 80 mph (128.75 km/h) | 83.95 mph (135.11 km/h) |
| 85 mph (136.79 km/h) | 89.2 mph (143.55 km/h) |
| 90 mph (144.84 km/h) | 94.45 mph (152 km/h) |
| 95 mph (152.89 km/h) | 99.69 mph (160.44 km/h) |
| 100 mph (160.93 km/h) | 104.94 mph (168.88 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
