Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/85-18 | 245/70-17.5 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 31 (787.5) | 4.97 (126.3) 19.1% |
| Width inches (mm) | 4.72 (120) | 9.65 (245) | 4.92 (125) 104.2% |
| Circum. inches (mm) | 81.78 (2077.22) | 97.4 (2474) | 15.62 (396.78) 19.1% |
| Sidewall Height inches (mm) | 4.02 (102) | 6.75 (171.5) | 2.74 (69.5) 68.1% |
| Revolutions per mile (km) | 774.76 (481.41) | 650.5 (404.2) | -124.26 (-77.21) -16% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.82 mph (38.34 km/h) |
| 25 mph (40.23 km/h) | 29.78 mph (47.92 km/h) |
| 30 mph (48.28 km/h) | 35.73 mph (57.5 km/h) |
| 35 mph (56.33 km/h) | 41.69 mph (67.09 km/h) |
| 40 mph (64.37 km/h) | 47.64 mph (76.67 km/h) |
| 45 mph (72.42 km/h) | 53.6 mph (86.25 km/h) |
| 50 mph (80.47 km/h) | 59.55 mph (95.84 km/h) |
| 55 mph (88.51 km/h) | 65.51 mph (105.42 km/h) |
| 60 mph (96.56 km/h) | 71.46 mph (115.01 km/h) |
| 65 mph (104.61 km/h) | 77.42 mph (124.59 km/h) |
| 70 mph (112.65 km/h) | 83.37 mph (134.17 km/h) |
| 75 mph (120.7 km/h) | 89.33 mph (143.76 km/h) |
| 80 mph (128.75 km/h) | 95.28 mph (153.34 km/h) |
| 85 mph (136.79 km/h) | 101.24 mph (162.92 km/h) |
| 90 mph (144.84 km/h) | 107.19 mph (172.51 km/h) |
| 95 mph (152.89 km/h) | 113.15 mph (182.09 km/h) |
| 100 mph (160.93 km/h) | 119.1 mph (191.68 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1655 | 1923 | 2071 | 2163 | 2261 | 2332 | 2409 | 2501 | 2628 | 2754 | 2895 | 3008 | 3212 | 3438 | 3614 | 3726 | 3790 | 4022 | 4346 | 5051 |
Better Fuel Economy Factory Ratios Increased Power
