Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/15.5-20 | 35/15.5-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.99 (965.04) | 35.06 (890.6) | -2.93 (-74.44) -7.7% |
| Width inches (mm) | 15.51 (394) | 15.51 (394) | 0 (0) 0% |
| Circum. inches (mm) | 119.36 (3031.76) | 110.15 (2797.9) | -9.21 (-233.86) -7.7% |
| Sidewall Height inches (mm) | 9 (228.52) | 8.53 (216.7) | -0.47 (-11.82) -5.2% |
| Revolutions per mile (km) | 530.83 (329.84) | 575.2 (357.41) | 44.37 (27.57) 8.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.46 mph (29.7 km/h) |
| 25 mph (40.23 km/h) | 23.07 mph (37.13 km/h) |
| 30 mph (48.28 km/h) | 27.69 mph (44.56 km/h) |
| 35 mph (56.33 km/h) | 32.3 mph (51.98 km/h) |
| 40 mph (64.37 km/h) | 36.91 mph (59.41 km/h) |
| 45 mph (72.42 km/h) | 41.53 mph (66.83 km/h) |
| 50 mph (80.47 km/h) | 46.14 mph (74.26 km/h) |
| 55 mph (88.51 km/h) | 50.76 mph (81.69 km/h) |
| 60 mph (96.56 km/h) | 55.37 mph (89.11 km/h) |
| 65 mph (104.61 km/h) | 59.99 mph (96.54 km/h) |
| 70 mph (112.65 km/h) | 64.6 mph (103.96 km/h) |
| 75 mph (120.7 km/h) | 69.21 mph (111.39 km/h) |
| 80 mph (128.75 km/h) | 73.83 mph (118.82 km/h) |
| 85 mph (136.79 km/h) | 78.44 mph (126.24 km/h) |
| 90 mph (144.84 km/h) | 83.06 mph (133.67 km/h) |
| 95 mph (152.89 km/h) | 87.67 mph (141.09 km/h) |
| 100 mph (160.93 km/h) | 92.29 mph (148.52 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 | 2062 | 2130 | 2211 | 2323 | 2435 | 2560 | 2660 | 2840 | 3040 | 3195 | 3295 | 3351 | 3557 | 3843 | 4466 |
Better Fuel Economy Factory Ratios Increased Power
