Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/50-21 | 285/60-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.83 (808.4) | 31.46 (799.2) | -0.36 (-9.2) -1.1% |
| Width inches (mm) | 10.83 (275) | 11.22 (285) | 0.39 (10) 3.6% |
| Circum. inches (mm) | 99.99 (2539.66) | 98.85 (2510.76) | -1.14 (-28.9) -1.1% |
| Sidewall Height inches (mm) | 5.41 (137.5) | 6.73 (171) | 1.32 (33.5) 24.4% |
| Revolutions per mile (km) | 633.68 (393.75) | 640.98 (398.28) | 7.29 (4.53) 1.2% |
285/60-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.77 mph (31.82 km/h) |
| 25 mph (40.23 km/h) | 24.72 mph (39.78 km/h) |
| 30 mph (48.28 km/h) | 29.66 mph (47.73 km/h) |
| 35 mph (56.33 km/h) | 34.6 mph (55.69 km/h) |
| 40 mph (64.37 km/h) | 39.54 mph (63.64 km/h) |
| 45 mph (72.42 km/h) | 44.49 mph (71.6 km/h) |
| 50 mph (80.47 km/h) | 49.43 mph (79.55 km/h) |
| 55 mph (88.51 km/h) | 54.37 mph (87.51 km/h) |
| 60 mph (96.56 km/h) | 59.32 mph (95.46 km/h) |
| 65 mph (104.61 km/h) | 64.26 mph (103.42 km/h) |
| 70 mph (112.65 km/h) | 69.2 mph (111.37 km/h) |
| 75 mph (120.7 km/h) | 74.15 mph (119.33 km/h) |
| 80 mph (128.75 km/h) | 79.09 mph (127.28 km/h) |
| 85 mph (136.79 km/h) | 84.03 mph (135.24 km/h) |
| 90 mph (144.84 km/h) | 88.98 mph (143.19 km/h) |
| 95 mph (152.89 km/h) | 93.92 mph (151.15 km/h) |
| 100 mph (160.93 km/h) | 98.86 mph (159.1 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1631 | 1895 | 2041 | 2131 | 2228 | 2298 | 2374 | 2464 | 2589 | 2714 | 2853 | 2964 | 3165 | 3387 | 3561 | 3672 | 3734 | 3963 | 4283 | 4977 |
Better Fuel Economy Factory Ratios Increased Power
