Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/15.5-20 | 385/65-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.99 (965.04) | 39.7 (1008.5) | 1.71 (43.46) 4.5% |
| Width inches (mm) | 15.51 (394) | 15.16 (385) | -0.35 (-9) -2.3% |
| Circum. inches (mm) | 119.36 (3031.76) | 124.74 (3168.3) | 5.38 (136.53) 4.5% |
| Sidewall Height inches (mm) | 9 (228.52) | 9.85 (250.25) | 0.86 (21.73) 9.5% |
| Revolutions per mile (km) | 530.83 (329.84) | 507.95 (315.63) | -22.88 (-14.21) -4.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.9 mph (33.64 km/h) |
| 25 mph (40.23 km/h) | 26.13 mph (42.05 km/h) |
| 30 mph (48.28 km/h) | 31.35 mph (50.45 km/h) |
| 35 mph (56.33 km/h) | 36.58 mph (58.86 km/h) |
| 40 mph (64.37 km/h) | 41.8 mph (67.27 km/h) |
| 45 mph (72.42 km/h) | 47.03 mph (75.68 km/h) |
| 50 mph (80.47 km/h) | 52.25 mph (84.09 km/h) |
| 55 mph (88.51 km/h) | 57.48 mph (92.5 km/h) |
| 60 mph (96.56 km/h) | 62.7 mph (100.91 km/h) |
| 65 mph (104.61 km/h) | 67.93 mph (109.32 km/h) |
| 70 mph (112.65 km/h) | 73.15 mph (117.73 km/h) |
| 75 mph (120.7 km/h) | 78.38 mph (126.14 km/h) |
| 80 mph (128.75 km/h) | 83.6 mph (134.55 km/h) |
| 85 mph (136.79 km/h) | 88.83 mph (142.95 km/h) |
| 90 mph (144.84 km/h) | 94.05 mph (151.36 km/h) |
| 95 mph (152.89 km/h) | 99.28 mph (159.77 km/h) |
| 100 mph (160.93 km/h) | 104.5 mph (168.18 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1293 | 1502 | 1617 | 1689 | 1766 | 1821 | 1881 | 1953 | 2052 | 2151 | 2261 | 2349 | 2508 | 2684 | 2822 | 2910 | 2959 | 3141 | 3394 | 3944 |
Better Fuel Economy Factory Ratios Increased Power
