Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/45-18 | 315/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.74 (704.7) | 27.92 (709.2) | 0.18 (4.5) 0.6% |
| Width inches (mm) | 10.83 (275) | 12.4 (315) | 1.57 (40) 14.5% |
| Circum. inches (mm) | 87.16 (2213.88) | 87.72 (2228.02) | 0.56 (14.14) 0.6% |
| Sidewall Height inches (mm) | 4.87 (123.75) | 4.96 (126) | 0.09 (2.25) 1.8% |
| Revolutions per mile (km) | 726.93 (451.69) | 722.32 (448.83) | -4.61 (-2.87) -0.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.13 mph (32.39 km/h) |
| 25 mph (40.23 km/h) | 25.16 mph (40.49 km/h) |
| 30 mph (48.28 km/h) | 30.19 mph (48.59 km/h) |
| 35 mph (56.33 km/h) | 35.22 mph (56.69 km/h) |
| 40 mph (64.37 km/h) | 40.26 mph (64.78 km/h) |
| 45 mph (72.42 km/h) | 45.29 mph (72.88 km/h) |
| 50 mph (80.47 km/h) | 50.32 mph (80.98 km/h) |
| 55 mph (88.51 km/h) | 55.35 mph (89.08 km/h) |
| 60 mph (96.56 km/h) | 60.38 mph (97.18 km/h) |
| 65 mph (104.61 km/h) | 65.42 mph (105.28 km/h) |
| 70 mph (112.65 km/h) | 70.45 mph (113.37 km/h) |
| 75 mph (120.7 km/h) | 75.48 mph (121.47 km/h) |
| 80 mph (128.75 km/h) | 80.51 mph (129.57 km/h) |
| 85 mph (136.79 km/h) | 85.54 mph (137.67 km/h) |
| 90 mph (144.84 km/h) | 90.57 mph (145.77 km/h) |
| 95 mph (152.89 km/h) | 95.61 mph (153.86 km/h) |
| 100 mph (160.93 km/h) | 100.64 mph (161.96 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
