Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/15.5-20 | 315/60-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.99 (965.04) | 34.88 (886) | -3.11 (-79.04) -8.2% |
| Width inches (mm) | 15.51 (394) | 12.4 (315) | -3.11 (-79) -20.1% |
| Circum. inches (mm) | 119.36 (3031.76) | 109.58 (2783.45) | -9.78 (-248.31) -8.2% |
| Sidewall Height inches (mm) | 9 (228.52) | 7.44 (189) | -1.56 (-39.52) -17.3% |
| Revolutions per mile (km) | 530.83 (329.84) | 578.18 (359.27) | 47.36 (29.43) 8.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.36 mph (29.55 km/h) |
| 25 mph (40.23 km/h) | 22.95 mph (36.94 km/h) |
| 30 mph (48.28 km/h) | 27.54 mph (44.33 km/h) |
| 35 mph (56.33 km/h) | 32.13 mph (51.71 km/h) |
| 40 mph (64.37 km/h) | 36.72 mph (59.1 km/h) |
| 45 mph (72.42 km/h) | 41.31 mph (66.49 km/h) |
| 50 mph (80.47 km/h) | 45.9 mph (73.88 km/h) |
| 55 mph (88.51 km/h) | 50.5 mph (81.26 km/h) |
| 60 mph (96.56 km/h) | 55.09 mph (88.65 km/h) |
| 65 mph (104.61 km/h) | 59.68 mph (96.04 km/h) |
| 70 mph (112.65 km/h) | 64.27 mph (103.43 km/h) |
| 75 mph (120.7 km/h) | 68.86 mph (110.82 km/h) |
| 80 mph (128.75 km/h) | 73.45 mph (118.2 km/h) |
| 85 mph (136.79 km/h) | 78.04 mph (125.59 km/h) |
| 90 mph (144.84 km/h) | 82.63 mph (132.98 km/h) |
| 95 mph (152.89 km/h) | 87.22 mph (140.37 km/h) |
| 100 mph (160.93 km/h) | 91.81 mph (147.75 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1471 | 1709 | 1841 | 1922 | 2010 | 2072 | 2141 | 2223 | 2335 | 2448 | 2573 | 2674 | 2855 | 3055 | 3212 | 3312 | 3368 | 3575 | 3863 | 4489 |
Better Fuel Economy Factory Ratios Increased Power
