Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/13.5-20 | 385/75-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 38.1 (967.62) | 42.74 (1085.5) | 4.64 (117.88) 12.2% |
| Width inches (mm) | 13.5 (343) | 15.16 (385) | 1.65 (42) 12.2% |
| Circum. inches (mm) | 119.68 (3039.87) | 134.26 (3410.2) | 14.58 (370.33) 12.2% |
| Sidewall Height inches (mm) | 9.05 (229.81) | 11.37 (288.75) | 2.32 (58.94) 25.6% |
| Revolutions per mile (km) | 529.41 (328.96) | 471.92 (293.24) | -57.49 (-35.72) -10.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.44 mph (36.11 km/h) |
| 25 mph (40.23 km/h) | 28.05 mph (45.14 km/h) |
| 30 mph (48.28 km/h) | 33.65 mph (54.16 km/h) |
| 35 mph (56.33 km/h) | 39.26 mph (63.19 km/h) |
| 40 mph (64.37 km/h) | 44.87 mph (72.22 km/h) |
| 45 mph (72.42 km/h) | 50.48 mph (81.24 km/h) |
| 50 mph (80.47 km/h) | 56.09 mph (90.27 km/h) |
| 55 mph (88.51 km/h) | 61.7 mph (99.3 km/h) |
| 60 mph (96.56 km/h) | 67.31 mph (108.32 km/h) |
| 65 mph (104.61 km/h) | 72.92 mph (117.35 km/h) |
| 70 mph (112.65 km/h) | 78.53 mph (126.38 km/h) |
| 75 mph (120.7 km/h) | 84.14 mph (135.41 km/h) |
| 80 mph (128.75 km/h) | 89.75 mph (144.43 km/h) |
| 85 mph (136.79 km/h) | 95.36 mph (153.46 km/h) |
| 90 mph (144.84 km/h) | 100.96 mph (162.49 km/h) |
| 95 mph (152.89 km/h) | 106.57 mph (171.51 km/h) |
| 100 mph (160.93 km/h) | 112.18 mph (180.54 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1201 | 1395 | 1502 | 1569 | 1640 | 1692 | 1748 | 1814 | 1906 | 1998 | 2100 | 2182 | 2330 | 2494 | 2622 | 2703 | 2749 | 2918 | 3153 | 3664 |
Better Fuel Economy Factory Ratios Increased Power
