Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/13.5-20 | 40/13.5-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 38.1 (967.62) | 39.96 (1014.9) | 1.86 (47.28) 4.9% |
| Width inches (mm) | 13.5 (343) | 13.5 (343) | 0 (0) 0% |
| Circum. inches (mm) | 119.68 (3039.87) | 125.53 (3188.4) | 5.85 (148.53) 4.9% |
| Sidewall Height inches (mm) | 9.05 (229.81) | 11.48 (291.55) | 2.43 (61.74) 26.9% |
| Revolutions per mile (km) | 529.41 (328.96) | 504.75 (313.64) | -24.66 (-15.32) -4.7% |
40/13.5-17 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.98 mph (33.76 km/h) |
| 25 mph (40.23 km/h) | 26.22 mph (42.2 km/h) |
| 30 mph (48.28 km/h) | 31.47 mph (50.64 km/h) |
| 35 mph (56.33 km/h) | 36.71 mph (59.08 km/h) |
| 40 mph (64.37 km/h) | 41.95 mph (67.52 km/h) |
| 45 mph (72.42 km/h) | 47.2 mph (75.96 km/h) |
| 50 mph (80.47 km/h) | 52.44 mph (84.4 km/h) |
| 55 mph (88.51 km/h) | 57.69 mph (92.84 km/h) |
| 60 mph (96.56 km/h) | 62.93 mph (101.28 km/h) |
| 65 mph (104.61 km/h) | 68.18 mph (109.72 km/h) |
| 70 mph (112.65 km/h) | 73.42 mph (118.16 km/h) |
| 75 mph (120.7 km/h) | 78.66 mph (126.6 km/h) |
| 80 mph (128.75 km/h) | 83.91 mph (135.04 km/h) |
| 85 mph (136.79 km/h) | 89.15 mph (143.48 km/h) |
| 90 mph (144.84 km/h) | 94.4 mph (151.92 km/h) |
| 95 mph (152.89 km/h) | 99.64 mph (160.36 km/h) |
| 100 mph (160.93 km/h) | 104.89 mph (168.8 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1284 | 1492 | 1607 | 1678 | 1755 | 1809 | 1869 | 1940 | 2039 | 2137 | 2246 | 2334 | 2492 | 2667 | 2804 | 2891 | 2941 | 3121 | 3372 | 3919 |
Better Fuel Economy Factory Ratios Increased Power
