Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/50-18 | 315/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.25 (692.2) | 27.92 (709.2) | 0.67 (17) 2.5% |
| Width inches (mm) | 9.25 (235) | 12.4 (315) | 3.15 (80) 34% |
| Circum. inches (mm) | 85.61 (2174.61) | 87.72 (2228.02) | 2.1 (53.41) 2.5% |
| Sidewall Height inches (mm) | 4.63 (117.5) | 4.96 (126) | 0.33 (8.5) 7.2% |
| Revolutions per mile (km) | 740.06 (459.85) | 722.32 (448.83) | -17.74 (-11.02) -2.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.49 mph (32.98 km/h) |
| 25 mph (40.23 km/h) | 25.61 mph (41.22 km/h) |
| 30 mph (48.28 km/h) | 30.74 mph (49.47 km/h) |
| 35 mph (56.33 km/h) | 35.86 mph (57.71 km/h) |
| 40 mph (64.37 km/h) | 40.98 mph (65.95 km/h) |
| 45 mph (72.42 km/h) | 46.11 mph (74.2 km/h) |
| 50 mph (80.47 km/h) | 51.23 mph (82.44 km/h) |
| 55 mph (88.51 km/h) | 56.35 mph (90.69 km/h) |
| 60 mph (96.56 km/h) | 61.47 mph (98.93 km/h) |
| 65 mph (104.61 km/h) | 66.6 mph (107.18 km/h) |
| 70 mph (112.65 km/h) | 71.72 mph (115.42 km/h) |
| 75 mph (120.7 km/h) | 76.84 mph (123.67 km/h) |
| 80 mph (128.75 km/h) | 81.96 mph (131.91 km/h) |
| 85 mph (136.79 km/h) | 87.09 mph (140.15 km/h) |
| 90 mph (144.84 km/h) | 92.21 mph (148.4 km/h) |
| 95 mph (152.89 km/h) | 97.33 mph (156.64 km/h) |
| 100 mph (160.93 km/h) | 102.46 mph (164.89 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1838 | 2135 | 2300 | 2401 | 2511 | 2589 | 2675 | 2777 | 2918 | 3058 | 3215 | 3340 | 3567 | 3817 | 4013 | 4138 | 4208 | 4466 | 4826 | 5608 |
Better Fuel Economy Factory Ratios Increased Power
