Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/40-21 | 285/35-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.66 (753.4) | 28.85 (732.9) | -0.81 (-20.5) -2.7% |
| Width inches (mm) | 10.83 (275) | 11.22 (285) | 0.39 (10) 3.6% |
| Circum. inches (mm) | 93.18 (2366.88) | 90.65 (2302.47) | -2.54 (-64.4) -2.7% |
| Sidewall Height inches (mm) | 4.33 (110) | 3.93 (99.75) | -0.4 (-10.25) -9.3% |
| Revolutions per mile (km) | 679.94 (422.5) | 698.96 (434.31) | 19.02 (11.82) 2.8% |
285/35-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.46 mph (31.31 km/h) |
| 25 mph (40.23 km/h) | 24.32 mph (39.14 km/h) |
| 30 mph (48.28 km/h) | 29.18 mph (46.97 km/h) |
| 35 mph (56.33 km/h) | 34.05 mph (54.79 km/h) |
| 40 mph (64.37 km/h) | 38.91 mph (62.62 km/h) |
| 45 mph (72.42 km/h) | 43.78 mph (70.45 km/h) |
| 50 mph (80.47 km/h) | 48.64 mph (78.28 km/h) |
| 55 mph (88.51 km/h) | 53.5 mph (86.11 km/h) |
| 60 mph (96.56 km/h) | 58.37 mph (93.93 km/h) |
| 65 mph (104.61 km/h) | 63.23 mph (101.76 km/h) |
| 70 mph (112.65 km/h) | 68.1 mph (109.59 km/h) |
| 75 mph (120.7 km/h) | 72.96 mph (117.42 km/h) |
| 80 mph (128.75 km/h) | 77.82 mph (125.24 km/h) |
| 85 mph (136.79 km/h) | 82.69 mph (133.07 km/h) |
| 90 mph (144.84 km/h) | 87.55 mph (140.9 km/h) |
| 95 mph (152.89 km/h) | 92.42 mph (148.73 km/h) |
| 100 mph (160.93 km/h) | 97.28 mph (156.56 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
