Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/70-18 | 305/75-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.92 (709.2) | 36.01 (914.7) | 8.09 (205.5) 29% |
| Width inches (mm) | 7.09 (180) | 12.01 (305) | 4.92 (125) 69.4% |
| Circum. inches (mm) | 87.72 (2228.02) | 113.13 (2873.61) | 25.42 (645.6) 29% |
| Sidewall Height inches (mm) | 4.96 (126) | 9.01 (228.75) | 4.05 (102.75) 81.5% |
| Revolutions per mile (km) | 722.32 (448.83) | 560.04 (347.99) | -162.28 (-100.84) -22.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 25.8 mph (41.51 km/h) |
| 25 mph (40.23 km/h) | 32.24 mph (51.89 km/h) |
| 30 mph (48.28 km/h) | 38.69 mph (62.27 km/h) |
| 35 mph (56.33 km/h) | 45.14 mph (72.65 km/h) |
| 40 mph (64.37 km/h) | 51.59 mph (83.03 km/h) |
| 45 mph (72.42 km/h) | 58.04 mph (93.41 km/h) |
| 50 mph (80.47 km/h) | 64.49 mph (103.78 km/h) |
| 55 mph (88.51 km/h) | 70.94 mph (114.16 km/h) |
| 60 mph (96.56 km/h) | 77.39 mph (124.54 km/h) |
| 65 mph (104.61 km/h) | 83.83 mph (134.92 km/h) |
| 70 mph (112.65 km/h) | 90.28 mph (145.3 km/h) |
| 75 mph (120.7 km/h) | 96.73 mph (155.68 km/h) |
| 80 mph (128.75 km/h) | 103.18 mph (166.05 km/h) |
| 85 mph (136.79 km/h) | 109.63 mph (176.43 km/h) |
| 90 mph (144.84 km/h) | 116.08 mph (186.81 km/h) |
| 95 mph (152.89 km/h) | 122.53 mph (197.19 km/h) |
| 100 mph (160.93 km/h) | 128.98 mph (207.57 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1425 | 1656 | 1783 | 1862 | 1947 | 2007 | 2074 | 2153 | 2262 | 2371 | 2493 | 2590 | 2765 | 2960 | 3111 | 3208 | 3263 | 3463 | 3742 | 4348 |
Better Fuel Economy Factory Ratios Increased Power
