Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/50-18 | 275/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.22 (742.2) | 27.74 (704.7) | -1.48 (-37.5) -5.1% |
| Width inches (mm) | 11.22 (285) | 10.83 (275) | -0.39 (-10) -3.5% |
| Circum. inches (mm) | 91.8 (2331.69) | 87.16 (2213.88) | -4.64 (-117.81) -5.1% |
| Sidewall Height inches (mm) | 5.61 (142.5) | 4.87 (123.75) | -0.74 (-18.75) -13.2% |
| Revolutions per mile (km) | 690.2 (428.87) | 726.93 (451.69) | 36.73 (22.82) 5.3% |
275/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.99 mph (30.56 km/h) |
| 25 mph (40.23 km/h) | 23.74 mph (38.2 km/h) |
| 30 mph (48.28 km/h) | 28.48 mph (45.84 km/h) |
| 35 mph (56.33 km/h) | 33.23 mph (53.48 km/h) |
| 40 mph (64.37 km/h) | 37.98 mph (61.12 km/h) |
| 45 mph (72.42 km/h) | 42.73 mph (68.76 km/h) |
| 50 mph (80.47 km/h) | 47.47 mph (76.4 km/h) |
| 55 mph (88.51 km/h) | 52.22 mph (84.04 km/h) |
| 60 mph (96.56 km/h) | 56.97 mph (91.68 km/h) |
| 65 mph (104.61 km/h) | 61.72 mph (99.32 km/h) |
| 70 mph (112.65 km/h) | 66.46 mph (106.96 km/h) |
| 75 mph (120.7 km/h) | 71.21 mph (114.6 km/h) |
| 80 mph (128.75 km/h) | 75.96 mph (122.24 km/h) |
| 85 mph (136.79 km/h) | 80.71 mph (129.88 km/h) |
| 90 mph (144.84 km/h) | 85.45 mph (137.52 km/h) |
| 95 mph (152.89 km/h) | 90.2 mph (145.16 km/h) |
| 100 mph (160.93 km/h) | 94.95 mph (152.8 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1850 | 2149 | 2314 | 2417 | 2527 | 2606 | 2692 | 2795 | 2936 | 3078 | 3235 | 3361 | 3590 | 3842 | 4038 | 4164 | 4235 | 4495 | 4857 | 5644 |
Better Fuel Economy Factory Ratios Increased Power
