Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/70-15 | 120/70-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 21.61 (549) | 23.61 (599.8) | 2 (50.8) 9.3% |
| Width inches (mm) | 4.72 (120) | 4.72 (120) | 0 (0) 0% |
| Circum. inches (mm) | 67.9 (1724.73) | 74.19 (1884.33) | 6.28 (159.59) 9.3% |
| Sidewall Height inches (mm) | 3.31 (84) | 3.31 (84) | 0 (0) 0% |
| Revolutions per mile (km) | 933.1 (579.8) | 854.07 (530.69) | -79.03 (-49.11) -8.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.85 mph (35.17 km/h) |
| 25 mph (40.23 km/h) | 27.31 mph (43.96 km/h) |
| 30 mph (48.28 km/h) | 32.78 mph (52.75 km/h) |
| 35 mph (56.33 km/h) | 38.24 mph (61.54 km/h) |
| 40 mph (64.37 km/h) | 43.7 mph (70.33 km/h) |
| 45 mph (72.42 km/h) | 49.16 mph (79.12 km/h) |
| 50 mph (80.47 km/h) | 54.63 mph (87.91 km/h) |
| 55 mph (88.51 km/h) | 60.09 mph (96.7 km/h) |
| 60 mph (96.56 km/h) | 65.55 mph (105.5 km/h) |
| 65 mph (104.61 km/h) | 71.01 mph (114.29 km/h) |
| 70 mph (112.65 km/h) | 76.48 mph (123.08 km/h) |
| 75 mph (120.7 km/h) | 81.94 mph (131.87 km/h) |
| 80 mph (128.75 km/h) | 87.4 mph (140.66 km/h) |
| 85 mph (136.79 km/h) | 92.87 mph (149.45 km/h) |
| 90 mph (144.84 km/h) | 98.33 mph (158.24 km/h) |
| 95 mph (152.89 km/h) | 103.79 mph (167.03 km/h) |
| 100 mph (160.93 km/h) | 109.25 mph (175.83 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2173 | 2525 | 2719 | 2839 | 2969 | 3061 | 3163 | 3283 | 3450 | 3616 | 3801 | 3949 | 4217 | 4513 | 4745 | 4893 | 4976 | 5281 | 5706 | 6631 |
Better Fuel Economy Factory Ratios Increased Power
