Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/45-21 | 275/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.97 (735.9) | 32.07 (814.7) | 3.1 (78.8) 10.7% |
| Width inches (mm) | 8.86 (225) | 10.83 (275) | 1.97 (50) 22.2% |
| Circum. inches (mm) | 91.02 (2311.9) | 100.77 (2559.46) | 9.75 (247.56) 10.7% |
| Sidewall Height inches (mm) | 3.99 (101.25) | 7.04 (178.75) | 3.05 (77.5) 76.5% |
| Revolutions per mile (km) | 696.11 (432.54) | 628.78 (390.71) | -67.33 (-41.84) -9.7% |
275/65-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.14 mph (35.63 km/h) |
| 25 mph (40.23 km/h) | 27.68 mph (44.54 km/h) |
| 30 mph (48.28 km/h) | 33.21 mph (53.45 km/h) |
| 35 mph (56.33 km/h) | 38.75 mph (62.36 km/h) |
| 40 mph (64.37 km/h) | 44.28 mph (71.27 km/h) |
| 45 mph (72.42 km/h) | 49.82 mph (80.18 km/h) |
| 50 mph (80.47 km/h) | 55.35 mph (89.08 km/h) |
| 55 mph (88.51 km/h) | 60.89 mph (97.99 km/h) |
| 60 mph (96.56 km/h) | 66.42 mph (106.9 km/h) |
| 65 mph (104.61 km/h) | 71.96 mph (115.81 km/h) |
| 70 mph (112.65 km/h) | 77.5 mph (124.72 km/h) |
| 75 mph (120.7 km/h) | 83.03 mph (133.63 km/h) |
| 80 mph (128.75 km/h) | 88.57 mph (142.53 km/h) |
| 85 mph (136.79 km/h) | 94.1 mph (151.44 km/h) |
| 90 mph (144.84 km/h) | 99.64 mph (160.35 km/h) |
| 95 mph (152.89 km/h) | 105.17 mph (169.26 km/h) |
| 100 mph (160.93 km/h) | 110.71 mph (178.17 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1600 | 1859 | 2002 | 2090 | 2186 | 2254 | 2329 | 2417 | 2540 | 2662 | 2799 | 2907 | 3105 | 3323 | 3493 | 3602 | 3663 | 3888 | 4201 | 4882 |
Better Fuel Economy Factory Ratios Increased Power
