Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/55-18 | 235/50-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.61 (726.7) | 27.25 (692.2) | -1.36 (-34.5) -4.7% |
| Width inches (mm) | 9.65 (245) | 9.25 (235) | -0.39 (-10) -4.1% |
| Circum. inches (mm) | 89.88 (2283) | 85.61 (2174.61) | -4.27 (-108.38) -4.7% |
| Sidewall Height inches (mm) | 5.31 (134.75) | 4.63 (117.5) | -0.68 (-17.25) -12.8% |
| Revolutions per mile (km) | 704.93 (438.02) | 740.06 (459.85) | 35.13 (21.83) 5% |
235/50-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.05 mph (30.66 km/h) |
| 25 mph (40.23 km/h) | 23.81 mph (38.32 km/h) |
| 30 mph (48.28 km/h) | 28.58 mph (45.99 km/h) |
| 35 mph (56.33 km/h) | 33.34 mph (53.65 km/h) |
| 40 mph (64.37 km/h) | 38.1 mph (61.32 km/h) |
| 45 mph (72.42 km/h) | 42.86 mph (68.98 km/h) |
| 50 mph (80.47 km/h) | 47.63 mph (76.65 km/h) |
| 55 mph (88.51 km/h) | 52.39 mph (84.31 km/h) |
| 60 mph (96.56 km/h) | 57.15 mph (91.98 km/h) |
| 65 mph (104.61 km/h) | 61.91 mph (99.64 km/h) |
| 70 mph (112.65 km/h) | 66.68 mph (107.31 km/h) |
| 75 mph (120.7 km/h) | 71.44 mph (114.97 km/h) |
| 80 mph (128.75 km/h) | 76.2 mph (122.64 km/h) |
| 85 mph (136.79 km/h) | 80.96 mph (130.3 km/h) |
| 90 mph (144.84 km/h) | 85.73 mph (137.96 km/h) |
| 95 mph (152.89 km/h) | 90.49 mph (145.63 km/h) |
| 100 mph (160.93 km/h) | 95.25 mph (153.29 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1883 | 2188 | 2356 | 2460 | 2573 | 2653 | 2741 | 2845 | 2989 | 3134 | 3294 | 3422 | 3654 | 3911 | 4111 | 4239 | 4312 | 4576 | 4945 | 5746 |
Better Fuel Economy Factory Ratios Increased Power
