Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/40-18 | 235/50-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.4 (645.2) | 27.25 (692.2) | 1.85 (47) 7.3% |
| Width inches (mm) | 9.25 (235) | 9.25 (235) | 0 (0) 0% |
| Circum. inches (mm) | 79.8 (2026.96) | 85.61 (2174.61) | 5.81 (147.65) 7.3% |
| Sidewall Height inches (mm) | 3.7 (94) | 4.63 (117.5) | 0.93 (23.5) 25% |
| Revolutions per mile (km) | 793.97 (493.35) | 740.06 (459.85) | -53.91 (-33.5) -6.8% |
235/50-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.46 mph (34.53 km/h) |
| 25 mph (40.23 km/h) | 26.82 mph (43.16 km/h) |
| 30 mph (48.28 km/h) | 32.19 mph (51.8 km/h) |
| 35 mph (56.33 km/h) | 37.55 mph (60.43 km/h) |
| 40 mph (64.37 km/h) | 42.91 mph (69.06 km/h) |
| 45 mph (72.42 km/h) | 48.28 mph (77.7 km/h) |
| 50 mph (80.47 km/h) | 53.64 mph (86.33 km/h) |
| 55 mph (88.51 km/h) | 59.01 mph (94.96 km/h) |
| 60 mph (96.56 km/h) | 64.37 mph (103.59 km/h) |
| 65 mph (104.61 km/h) | 69.73 mph (112.23 km/h) |
| 70 mph (112.65 km/h) | 75.1 mph (120.86 km/h) |
| 75 mph (120.7 km/h) | 80.46 mph (129.49 km/h) |
| 80 mph (128.75 km/h) | 85.83 mph (138.13 km/h) |
| 85 mph (136.79 km/h) | 91.19 mph (146.76 km/h) |
| 90 mph (144.84 km/h) | 96.56 mph (155.39 km/h) |
| 95 mph (152.89 km/h) | 101.92 mph (164.03 km/h) |
| 100 mph (160.93 km/h) | 107.28 mph (172.66 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
