Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/13.5-20 | 32/13.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 38.1 (967.62) | 31.88 (809.84) | -6.21 (-157.78) -16.3% |
| Width inches (mm) | 13.5 (343) | 13.5 (343) | 0 (0) 0% |
| Circum. inches (mm) | 119.68 (3039.87) | 100.16 (2544.19) | -19.51 (-495.68) -16.3% |
| Sidewall Height inches (mm) | 9.05 (229.81) | 5.94 (150.92) | -3.11 (-78.89) -34.3% |
| Revolutions per mile (km) | 529.41 (328.96) | 632.56 (393.05) | 103.14 (64.09) 19.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 16.74 mph (26.94 km/h) |
| 25 mph (40.23 km/h) | 20.92 mph (33.67 km/h) |
| 30 mph (48.28 km/h) | 25.11 mph (40.41 km/h) |
| 35 mph (56.33 km/h) | 29.29 mph (47.14 km/h) |
| 40 mph (64.37 km/h) | 33.48 mph (53.88 km/h) |
| 45 mph (72.42 km/h) | 37.66 mph (60.61 km/h) |
| 50 mph (80.47 km/h) | 41.85 mph (67.35 km/h) |
| 55 mph (88.51 km/h) | 46.03 mph (74.08 km/h) |
| 60 mph (96.56 km/h) | 50.22 mph (80.82 km/h) |
| 65 mph (104.61 km/h) | 54.4 mph (87.55 km/h) |
| 70 mph (112.65 km/h) | 58.59 mph (94.28 km/h) |
| 75 mph (120.7 km/h) | 62.77 mph (101.02 km/h) |
| 80 mph (128.75 km/h) | 66.96 mph (107.75 km/h) |
| 85 mph (136.79 km/h) | 71.14 mph (114.49 km/h) |
| 90 mph (144.84 km/h) | 75.32 mph (121.22 km/h) |
| 95 mph (152.89 km/h) | 79.51 mph (127.96 km/h) |
| 100 mph (160.93 km/h) | 83.69 mph (134.69 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1610 | 1870 | 2014 | 2103 | 2199 | 2267 | 2343 | 2432 | 2555 | 2678 | 2815 | 2925 | 3124 | 3343 | 3514 | 3624 | 3685 | 3911 | 4226 | 4911 |
Better Fuel Economy Factory Ratios Increased Power
