Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/70-18 | 300/85-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.92 (709.2) | 38.08 (967.2) | 10.16 (258) 36.4% |
| Width inches (mm) | 7.09 (180) | 11.81 (300) | 4.72 (120) 66.7% |
| Circum. inches (mm) | 87.72 (2228.02) | 119.63 (3038.55) | 31.91 (810.53) 36.4% |
| Sidewall Height inches (mm) | 4.96 (126) | 10.04 (255) | 5.08 (129) 102.4% |
| Revolutions per mile (km) | 722.32 (448.83) | 529.64 (329.1) | -192.68 (-119.72) -26.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 27.28 mph (43.9 km/h) |
| 25 mph (40.23 km/h) | 34.09 mph (54.87 km/h) |
| 30 mph (48.28 km/h) | 40.91 mph (65.84 km/h) |
| 35 mph (56.33 km/h) | 47.73 mph (76.82 km/h) |
| 40 mph (64.37 km/h) | 54.55 mph (87.79 km/h) |
| 45 mph (72.42 km/h) | 61.37 mph (98.77 km/h) |
| 50 mph (80.47 km/h) | 68.19 mph (109.74 km/h) |
| 55 mph (88.51 km/h) | 75.01 mph (120.71 km/h) |
| 60 mph (96.56 km/h) | 81.83 mph (131.69 km/h) |
| 65 mph (104.61 km/h) | 88.65 mph (142.66 km/h) |
| 70 mph (112.65 km/h) | 95.47 mph (153.64 km/h) |
| 75 mph (120.7 km/h) | 102.28 mph (164.61 km/h) |
| 80 mph (128.75 km/h) | 109.1 mph (175.58 km/h) |
| 85 mph (136.79 km/h) | 115.92 mph (186.56 km/h) |
| 90 mph (144.84 km/h) | 122.74 mph (197.53 km/h) |
| 95 mph (152.89 km/h) | 129.56 mph (208.51 km/h) |
| 100 mph (160.93 km/h) | 136.38 mph (219.48 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1348 | 1566 | 1686 | 1761 | 1841 | 1898 | 1962 | 2036 | 2139 | 2243 | 2357 | 2449 | 2615 | 2799 | 2942 | 3034 | 3086 | 3275 | 3539 | 4112 |
Better Fuel Economy Factory Ratios Increased Power
