Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/85-18 | 255/85-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.37 (720.7) | 35.07 (890.7) | 6.69 (170) 23.6% |
| Width inches (mm) | 6.1 (155) | 10.04 (255) | 3.94 (100) 64.5% |
| Circum. inches (mm) | 89.14 (2264.15) | 110.17 (2798.22) | 21.03 (534.07) 23.6% |
| Sidewall Height inches (mm) | 5.19 (131.75) | 8.53 (216.75) | 3.35 (85) 64.5% |
| Revolutions per mile (km) | 710.8 (441.67) | 575.13 (357.37) | -135.66 (-84.3) -19.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 24.72 mph (39.78 km/h) |
| 25 mph (40.23 km/h) | 30.9 mph (49.72 km/h) |
| 30 mph (48.28 km/h) | 37.08 mph (59.67 km/h) |
| 35 mph (56.33 km/h) | 43.26 mph (69.61 km/h) |
| 40 mph (64.37 km/h) | 49.44 mph (79.56 km/h) |
| 45 mph (72.42 km/h) | 55.61 mph (89.5 km/h) |
| 50 mph (80.47 km/h) | 61.79 mph (99.45 km/h) |
| 55 mph (88.51 km/h) | 67.97 mph (109.39 km/h) |
| 60 mph (96.56 km/h) | 74.15 mph (119.34 km/h) |
| 65 mph (104.61 km/h) | 80.33 mph (129.28 km/h) |
| 70 mph (112.65 km/h) | 86.51 mph (139.23 km/h) |
| 75 mph (120.7 km/h) | 92.69 mph (149.17 km/h) |
| 80 mph (128.75 km/h) | 98.87 mph (159.12 km/h) |
| 85 mph (136.79 km/h) | 105.05 mph (169.06 km/h) |
| 90 mph (144.84 km/h) | 111.23 mph (179.01 km/h) |
| 95 mph (152.89 km/h) | 117.41 mph (188.95 km/h) |
| 100 mph (160.93 km/h) | 123.59 mph (198.9 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1464 | 1700 | 1831 | 1912 | 1999 | 2061 | 2130 | 2211 | 2323 | 2435 | 2560 | 2659 | 2840 | 3039 | 3195 | 3295 | 3351 | 3556 | 3843 | 4466 |
Better Fuel Economy Factory Ratios Increased Power
