Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/45-18 | 225/50-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.33 (668.7) | 26.86 (682.2) | 0.53 (13.5) 2% |
| Width inches (mm) | 9.25 (235) | 8.86 (225) | -0.39 (-10) -4.3% |
| Circum. inches (mm) | 82.71 (2100.78) | 84.38 (2143.19) | 1.67 (42.41) 2% |
| Sidewall Height inches (mm) | 4.16 (105.75) | 4.43 (112.5) | 0.27 (6.75) 6.4% |
| Revolutions per mile (km) | 766.07 (476.01) | 750.91 (466.59) | -15.16 (-9.42) -2% |
225/50-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.4 mph (32.84 km/h) |
| 25 mph (40.23 km/h) | 25.5 mph (41.05 km/h) |
| 30 mph (48.28 km/h) | 30.61 mph (49.26 km/h) |
| 35 mph (56.33 km/h) | 35.71 mph (57.46 km/h) |
| 40 mph (64.37 km/h) | 40.81 mph (65.67 km/h) |
| 45 mph (72.42 km/h) | 45.91 mph (73.88 km/h) |
| 50 mph (80.47 km/h) | 51.01 mph (82.09 km/h) |
| 55 mph (88.51 km/h) | 56.11 mph (90.3 km/h) |
| 60 mph (96.56 km/h) | 61.21 mph (98.51 km/h) |
| 65 mph (104.61 km/h) | 66.31 mph (106.72 km/h) |
| 70 mph (112.65 km/h) | 71.41 mph (114.93 km/h) |
| 75 mph (120.7 km/h) | 76.51 mph (123.14 km/h) |
| 80 mph (128.75 km/h) | 81.62 mph (131.35 km/h) |
| 85 mph (136.79 km/h) | 86.72 mph (139.56 km/h) |
| 90 mph (144.84 km/h) | 91.82 mph (147.77 km/h) |
| 95 mph (152.89 km/h) | 96.92 mph (155.97 km/h) |
| 100 mph (160.93 km/h) | 102.02 mph (164.18 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1911 | 2220 | 2391 | 2496 | 2610 | 2692 | 2781 | 2887 | 3033 | 3179 | 3342 | 3472 | 3708 | 3968 | 4171 | 4302 | 4375 | 4643 | 5017 | 5830 |
Better Fuel Economy Factory Ratios Increased Power
