Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/13.5-20 | 390/60-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 38.1 (967.62) | 38.43 (976) | 0.33 (8.38) 0.9% |
| Width inches (mm) | 13.5 (343) | 15.35 (390) | 1.85 (47) 13.7% |
| Circum. inches (mm) | 119.68 (3039.87) | 120.72 (3066.19) | 1.04 (26.33) 0.9% |
| Sidewall Height inches (mm) | 9.05 (229.81) | 9.21 (234) | 0.16 (4.19) 1.8% |
| Revolutions per mile (km) | 529.41 (328.96) | 524.87 (326.14) | -4.55 (-2.82) -0.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.17 mph (32.47 km/h) |
| 25 mph (40.23 km/h) | 25.22 mph (40.58 km/h) |
| 30 mph (48.28 km/h) | 30.26 mph (48.7 km/h) |
| 35 mph (56.33 km/h) | 35.3 mph (56.81 km/h) |
| 40 mph (64.37 km/h) | 40.35 mph (64.93 km/h) |
| 45 mph (72.42 km/h) | 45.39 mph (73.05 km/h) |
| 50 mph (80.47 km/h) | 50.43 mph (81.16 km/h) |
| 55 mph (88.51 km/h) | 55.48 mph (89.28 km/h) |
| 60 mph (96.56 km/h) | 60.52 mph (97.4 km/h) |
| 65 mph (104.61 km/h) | 65.56 mph (105.51 km/h) |
| 70 mph (112.65 km/h) | 70.61 mph (113.63 km/h) |
| 75 mph (120.7 km/h) | 75.65 mph (121.75 km/h) |
| 80 mph (128.75 km/h) | 80.69 mph (129.86 km/h) |
| 85 mph (136.79 km/h) | 85.74 mph (137.98 km/h) |
| 90 mph (144.84 km/h) | 90.78 mph (146.1 km/h) |
| 95 mph (152.89 km/h) | 95.82 mph (154.21 km/h) |
| 100 mph (160.93 km/h) | 100.87 mph (162.33 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1336 | 1552 | 1671 | 1745 | 1824 | 1881 | 1944 | 2018 | 2120 | 2222 | 2336 | 2427 | 2592 | 2774 | 2916 | 3007 | 3058 | 3245 | 3507 | 4075 |
Better Fuel Economy Factory Ratios Increased Power
