Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 395/85-20 | 37/13.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 46.44 (1179.5) | 37.01 (940.18) | -9.42 (-239.32) -20.3% |
| Width inches (mm) | 15.55 (395) | 13.5 (343) | -2.05 (-52) -13.2% |
| Circum. inches (mm) | 145.89 (3705.51) | 116.29 (2953.66) | -29.6 (-751.85) -20.3% |
| Sidewall Height inches (mm) | 13.22 (335.75) | 8.51 (216.09) | -4.71 (-119.66) -35.6% |
| Revolutions per mile (km) | 434.31 (269.87) | 544.86 (338.56) | 110.55 (68.69) 25.5% |
37/13.5-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 15.94 mph (25.66 km/h) |
| 25 mph (40.23 km/h) | 19.93 mph (32.07 km/h) |
| 30 mph (48.28 km/h) | 23.91 mph (38.48 km/h) |
| 35 mph (56.33 km/h) | 27.9 mph (44.9 km/h) |
| 40 mph (64.37 km/h) | 31.88 mph (51.31 km/h) |
| 45 mph (72.42 km/h) | 35.87 mph (57.73 km/h) |
| 50 mph (80.47 km/h) | 39.86 mph (64.14 km/h) |
| 55 mph (88.51 km/h) | 43.84 mph (70.55 km/h) |
| 60 mph (96.56 km/h) | 47.83 mph (76.97 km/h) |
| 65 mph (104.61 km/h) | 51.81 mph (83.38 km/h) |
| 70 mph (112.65 km/h) | 55.8 mph (89.8 km/h) |
| 75 mph (120.7 km/h) | 59.78 mph (96.21 km/h) |
| 80 mph (128.75 km/h) | 63.77 mph (102.62 km/h) |
| 85 mph (136.79 km/h) | 67.75 mph (109.04 km/h) |
| 90 mph (144.84 km/h) | 71.74 mph (115.45 km/h) |
| 95 mph (152.89 km/h) | 75.72 mph (121.87 km/h) |
| 100 mph (160.93 km/h) | 79.71 mph (128.28 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
