Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/65-18 | 305/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.07 (814.7) | 34.81 (884.2) | 2.74 (69.5) 8.5% |
| Width inches (mm) | 10.83 (275) | 12.01 (305) | 1.18 (30) 10.9% |
| Circum. inches (mm) | 100.77 (2559.46) | 109.36 (2777.8) | 8.6 (218.34) 8.5% |
| Sidewall Height inches (mm) | 7.04 (178.75) | 8.41 (213.5) | 1.37 (34.75) 19.4% |
| Revolutions per mile (km) | 628.78 (390.71) | 579.36 (360) | -49.42 (-30.71) -7.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.71 mph (34.93 km/h) |
| 25 mph (40.23 km/h) | 27.13 mph (43.67 km/h) |
| 30 mph (48.28 km/h) | 32.56 mph (52.4 km/h) |
| 35 mph (56.33 km/h) | 37.99 mph (61.13 km/h) |
| 40 mph (64.37 km/h) | 43.41 mph (69.87 km/h) |
| 45 mph (72.42 km/h) | 48.84 mph (78.6 km/h) |
| 50 mph (80.47 km/h) | 54.27 mph (87.33 km/h) |
| 55 mph (88.51 km/h) | 59.69 mph (96.07 km/h) |
| 60 mph (96.56 km/h) | 65.12 mph (104.8 km/h) |
| 65 mph (104.61 km/h) | 70.54 mph (113.53 km/h) |
| 70 mph (112.65 km/h) | 75.97 mph (122.26 km/h) |
| 75 mph (120.7 km/h) | 81.4 mph (131 km/h) |
| 80 mph (128.75 km/h) | 86.82 mph (139.73 km/h) |
| 85 mph (136.79 km/h) | 92.25 mph (148.46 km/h) |
| 90 mph (144.84 km/h) | 97.68 mph (157.2 km/h) |
| 95 mph (152.89 km/h) | 103.1 mph (165.93 km/h) |
| 100 mph (160.93 km/h) | 108.53 mph (174.66 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1474 | 1713 | 1845 | 1926 | 2014 | 2077 | 2146 | 2227 | 2340 | 2453 | 2579 | 2679 | 2861 | 3062 | 3218 | 3319 | 3375 | 3582 | 3871 | 4498 |
Better Fuel Economy Factory Ratios Increased Power
