Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/15.5-20 | 36/15.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.99 (965.04) | 36.13 (917.76) | -1.86 (-47.28) -4.9% |
| Width inches (mm) | 15.51 (394) | 15.51 (394) | 0 (0) 0% |
| Circum. inches (mm) | 119.36 (3031.76) | 113.51 (2883.23) | -5.85 (-148.53) -4.9% |
| Sidewall Height inches (mm) | 9 (228.52) | 8.07 (204.88) | -0.93 (-23.64) -10.3% |
| Revolutions per mile (km) | 530.83 (329.84) | 558.17 (346.83) | 27.35 (16.99) 5.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.02 mph (30.61 km/h) |
| 25 mph (40.23 km/h) | 23.78 mph (38.26 km/h) |
| 30 mph (48.28 km/h) | 28.53 mph (45.92 km/h) |
| 35 mph (56.33 km/h) | 33.29 mph (53.57 km/h) |
| 40 mph (64.37 km/h) | 38.04 mph (61.22 km/h) |
| 45 mph (72.42 km/h) | 42.8 mph (68.87 km/h) |
| 50 mph (80.47 km/h) | 47.55 mph (76.53 km/h) |
| 55 mph (88.51 km/h) | 52.31 mph (84.18 km/h) |
| 60 mph (96.56 km/h) | 57.06 mph (91.83 km/h) |
| 65 mph (104.61 km/h) | 61.82 mph (99.48 km/h) |
| 70 mph (112.65 km/h) | 66.57 mph (107.14 km/h) |
| 75 mph (120.7 km/h) | 71.33 mph (114.79 km/h) |
| 80 mph (128.75 km/h) | 76.08 mph (122.44 km/h) |
| 85 mph (136.79 km/h) | 80.84 mph (130.09 km/h) |
| 90 mph (144.84 km/h) | 85.59 mph (137.75 km/h) |
| 95 mph (152.89 km/h) | 90.35 mph (145.4 km/h) |
| 100 mph (160.93 km/h) | 95.1 mph (153.05 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1420 | 1650 | 1777 | 1856 | 1940 | 2001 | 2067 | 2146 | 2255 | 2363 | 2484 | 2581 | 2756 | 2950 | 3101 | 3198 | 3252 | 3451 | 3729 | 4334 |
Better Fuel Economy Factory Ratios Increased Power
