Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/55-21 | 285/45-24 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.91 (835.9) | 34.1 (866.1) | 1.19 (30.2) 3.6% |
| Width inches (mm) | 10.83 (275) | 11.22 (285) | 0.39 (10) 3.6% |
| Circum. inches (mm) | 103.39 (2626.06) | 107.12 (2720.93) | 3.74 (94.88) 3.6% |
| Sidewall Height inches (mm) | 5.95 (151.25) | 5.05 (128.25) | -0.91 (-23) -15.2% |
| Revolutions per mile (km) | 612.84 (380.8) | 591.47 (367.52) | -21.37 (-13.28) -3.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.72 mph (33.35 km/h) |
| 25 mph (40.23 km/h) | 25.9 mph (41.69 km/h) |
| 30 mph (48.28 km/h) | 31.08 mph (50.02 km/h) |
| 35 mph (56.33 km/h) | 36.26 mph (58.36 km/h) |
| 40 mph (64.37 km/h) | 41.45 mph (66.7 km/h) |
| 45 mph (72.42 km/h) | 46.63 mph (75.04 km/h) |
| 50 mph (80.47 km/h) | 51.81 mph (83.37 km/h) |
| 55 mph (88.51 km/h) | 56.99 mph (91.71 km/h) |
| 60 mph (96.56 km/h) | 62.17 mph (100.05 km/h) |
| 65 mph (104.61 km/h) | 67.35 mph (108.39 km/h) |
| 70 mph (112.65 km/h) | 72.53 mph (116.72 km/h) |
| 75 mph (120.7 km/h) | 77.71 mph (125.06 km/h) |
| 80 mph (128.75 km/h) | 82.89 mph (133.4 km/h) |
| 85 mph (136.79 km/h) | 88.07 mph (141.74 km/h) |
| 90 mph (144.84 km/h) | 93.25 mph (150.07 km/h) |
| 95 mph (152.89 km/h) | 98.43 mph (158.41 km/h) |
| 100 mph (160.93 km/h) | 103.61 mph (166.75 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1505 | 1749 | 1883 | 1966 | 2056 | 2120 | 2191 | 2274 | 2389 | 2504 | 2632 | 2735 | 2921 | 3126 | 3286 | 3388 | 3446 | 3657 | 3952 | 4592 |
Better Fuel Economy Factory Ratios Increased Power
