Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/85-18 | 205/85-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 30.72 (780.3) | 4.69 (119.1) 18% |
| Width inches (mm) | 4.72 (120) | 8.07 (205) | 3.35 (85) 70.8% |
| Circum. inches (mm) | 81.78 (2077.22) | 96.51 (2451.38) | 14.73 (374.16) 18% |
| Sidewall Height inches (mm) | 4.02 (102) | 6.86 (174.25) | 2.84 (72.25) 70.8% |
| Revolutions per mile (km) | 774.76 (481.41) | 656.5 (407.93) | -118.25 (-73.48) -15.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.6 mph (37.98 km/h) |
| 25 mph (40.23 km/h) | 29.5 mph (47.48 km/h) |
| 30 mph (48.28 km/h) | 35.4 mph (56.98 km/h) |
| 35 mph (56.33 km/h) | 41.3 mph (66.47 km/h) |
| 40 mph (64.37 km/h) | 47.21 mph (75.97 km/h) |
| 45 mph (72.42 km/h) | 53.11 mph (85.47 km/h) |
| 50 mph (80.47 km/h) | 59.01 mph (94.96 km/h) |
| 55 mph (88.51 km/h) | 64.91 mph (104.46 km/h) |
| 60 mph (96.56 km/h) | 70.81 mph (113.95 km/h) |
| 65 mph (104.61 km/h) | 76.71 mph (123.45 km/h) |
| 70 mph (112.65 km/h) | 82.61 mph (132.95 km/h) |
| 75 mph (120.7 km/h) | 88.51 mph (142.44 km/h) |
| 80 mph (128.75 km/h) | 94.41 mph (151.94 km/h) |
| 85 mph (136.79 km/h) | 100.31 mph (161.43 km/h) |
| 90 mph (144.84 km/h) | 106.21 mph (170.93 km/h) |
| 95 mph (152.89 km/h) | 112.11 mph (180.43 km/h) |
| 100 mph (160.93 km/h) | 118.01 mph (189.92 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1671 | 1941 | 2090 | 2183 | 2282 | 2353 | 2431 | 2524 | 2652 | 2780 | 2922 | 3036 | 3242 | 3469 | 3647 | 3761 | 3825 | 4059 | 4386 | 5097 |
Better Fuel Economy Factory Ratios Increased Power
