Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 185/65-18 | 305/45-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.47 (697.7) | 27.81 (706.3) | 0.34 (8.6) 1.2% |
| Width inches (mm) | 7.28 (185) | 12.01 (305) | 4.72 (120) 64.9% |
| Circum. inches (mm) | 86.29 (2191.89) | 87.36 (2218.91) | 1.06 (27.02) 1.2% |
| Sidewall Height inches (mm) | 4.73 (120.25) | 5.4 (137.25) | 0.67 (17) 14.1% |
| Revolutions per mile (km) | 734.23 (456.23) | 725.29 (450.67) | -8.94 (-5.56) -1.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.25 mph (32.58 km/h) |
| 25 mph (40.23 km/h) | 25.31 mph (40.73 km/h) |
| 30 mph (48.28 km/h) | 30.37 mph (48.88 km/h) |
| 35 mph (56.33 km/h) | 35.43 mph (57.02 km/h) |
| 40 mph (64.37 km/h) | 40.49 mph (65.17 km/h) |
| 45 mph (72.42 km/h) | 45.55 mph (73.31 km/h) |
| 50 mph (80.47 km/h) | 50.62 mph (81.46 km/h) |
| 55 mph (88.51 km/h) | 55.68 mph (89.61 km/h) |
| 60 mph (96.56 km/h) | 60.74 mph (97.75 km/h) |
| 65 mph (104.61 km/h) | 65.8 mph (105.9 km/h) |
| 70 mph (112.65 km/h) | 70.86 mph (114.04 km/h) |
| 75 mph (120.7 km/h) | 75.92 mph (122.19 km/h) |
| 80 mph (128.75 km/h) | 80.99 mph (130.33 km/h) |
| 85 mph (136.79 km/h) | 86.05 mph (138.48 km/h) |
| 90 mph (144.84 km/h) | 91.11 mph (146.63 km/h) |
| 95 mph (152.89 km/h) | 96.17 mph (154.77 km/h) |
| 100 mph (160.93 km/h) | 101.23 mph (162.92 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1846 | 2144 | 2309 | 2411 | 2521 | 2600 | 2686 | 2788 | 2930 | 3071 | 3228 | 3354 | 3581 | 3833 | 4029 | 4155 | 4226 | 4485 | 4846 | 5631 |
Better Fuel Economy Factory Ratios Increased Power
