Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/13.5-20 | 37/13.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 38.1 (967.62) | 37.01 (940.18) | -1.08 (-27.44) -2.8% |
| Width inches (mm) | 13.5 (343) | 13.5 (343) | 0 (0) 0% |
| Circum. inches (mm) | 119.68 (3039.87) | 116.29 (2953.66) | -3.39 (-86.21) -2.8% |
| Sidewall Height inches (mm) | 9.05 (229.81) | 8.51 (216.09) | -0.54 (-13.72) -6% |
| Revolutions per mile (km) | 529.41 (328.96) | 544.86 (338.56) | 15.45 (9.6) 2.9% |
37/13.5-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.43 mph (31.27 km/h) |
| 25 mph (40.23 km/h) | 24.29 mph (39.09 km/h) |
| 30 mph (48.28 km/h) | 29.15 mph (46.91 km/h) |
| 35 mph (56.33 km/h) | 34.01 mph (54.73 km/h) |
| 40 mph (64.37 km/h) | 38.87 mph (62.55 km/h) |
| 45 mph (72.42 km/h) | 43.72 mph (70.37 km/h) |
| 50 mph (80.47 km/h) | 48.58 mph (78.19 km/h) |
| 55 mph (88.51 km/h) | 53.44 mph (86 km/h) |
| 60 mph (96.56 km/h) | 58.3 mph (93.82 km/h) |
| 65 mph (104.61 km/h) | 63.16 mph (101.64 km/h) |
| 70 mph (112.65 km/h) | 68.01 mph (109.46 km/h) |
| 75 mph (120.7 km/h) | 72.87 mph (117.28 km/h) |
| 80 mph (128.75 km/h) | 77.73 mph (125.1 km/h) |
| 85 mph (136.79 km/h) | 82.59 mph (132.92 km/h) |
| 90 mph (144.84 km/h) | 87.45 mph (140.73 km/h) |
| 95 mph (152.89 km/h) | 92.31 mph (148.55 km/h) |
| 100 mph (160.93 km/h) | 97.16 mph (156.37 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1387 | 1611 | 1735 | 1811 | 1894 | 1953 | 2018 | 2095 | 2201 | 2307 | 2425 | 2519 | 2691 | 2879 | 3027 | 3121 | 3174 | 3369 | 3640 | 4231 |
Better Fuel Economy Factory Ratios Increased Power
