Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/85-18 | 220/90-17.5 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 33.09 (840.5) | 7.06 (179.3) 27.1% |
| Width inches (mm) | 4.72 (120) | 8.66 (220) | 3.94 (100) 83.3% |
| Circum. inches (mm) | 81.78 (2077.22) | 103.96 (2640.51) | 22.18 (563.29) 27.1% |
| Sidewall Height inches (mm) | 4.02 (102) | 7.8 (198) | 3.78 (96) 94.1% |
| Revolutions per mile (km) | 774.76 (481.41) | 609.48 (378.71) | -165.28 (-102.7) -21.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 25.42 mph (40.92 km/h) |
| 25 mph (40.23 km/h) | 31.78 mph (51.14 km/h) |
| 30 mph (48.28 km/h) | 38.14 mph (61.37 km/h) |
| 35 mph (56.33 km/h) | 44.49 mph (71.6 km/h) |
| 40 mph (64.37 km/h) | 50.85 mph (81.83 km/h) |
| 45 mph (72.42 km/h) | 57.2 mph (92.06 km/h) |
| 50 mph (80.47 km/h) | 63.56 mph (102.29 km/h) |
| 55 mph (88.51 km/h) | 69.91 mph (112.52 km/h) |
| 60 mph (96.56 km/h) | 76.27 mph (122.75 km/h) |
| 65 mph (104.61 km/h) | 82.63 mph (132.97 km/h) |
| 70 mph (112.65 km/h) | 88.98 mph (143.2 km/h) |
| 75 mph (120.7 km/h) | 95.34 mph (153.43 km/h) |
| 80 mph (128.75 km/h) | 101.69 mph (163.66 km/h) |
| 85 mph (136.79 km/h) | 108.05 mph (173.89 km/h) |
| 90 mph (144.84 km/h) | 114.41 mph (184.12 km/h) |
| 95 mph (152.89 km/h) | 120.76 mph (194.35 km/h) |
| 100 mph (160.93 km/h) | 127.12 mph (204.58 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1551 | 1802 | 1940 | 2026 | 2119 | 2185 | 2257 | 2343 | 2462 | 2581 | 2713 | 2818 | 3010 | 3221 | 3386 | 3491 | 3551 | 3769 | 4072 | 4732 |
Better Fuel Economy Factory Ratios Increased Power
