Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/85-16 | 37/12.5-16.5 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.73 (805.9) | 37.03 (940.62) | 5.3 (134.72) 16.7% |
| Width inches (mm) | 9.25 (235) | 12.52 (318) | 3.27 (83) 35.3% |
| Circum. inches (mm) | 99.68 (2531.81) | 116.34 (2955.04) | 16.66 (423.24) 16.7% |
| Sidewall Height inches (mm) | 7.86 (199.75) | 10.27 (260.76) | 2.4 (61.01) 30.5% |
| Revolutions per mile (km) | 635.65 (394.97) | 544.61 (338.4) | -91.04 (-56.57) -14.3% |
37/12.5-16.5 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.34 mph (37.57 km/h) |
| 25 mph (40.23 km/h) | 29.18 mph (46.96 km/h) |
| 30 mph (48.28 km/h) | 35.02 mph (56.35 km/h) |
| 35 mph (56.33 km/h) | 40.85 mph (65.74 km/h) |
| 40 mph (64.37 km/h) | 46.69 mph (75.14 km/h) |
| 45 mph (72.42 km/h) | 52.52 mph (84.53 km/h) |
| 50 mph (80.47 km/h) | 58.36 mph (93.92 km/h) |
| 55 mph (88.51 km/h) | 64.19 mph (103.31 km/h) |
| 60 mph (96.56 km/h) | 70.03 mph (112.7 km/h) |
| 65 mph (104.61 km/h) | 75.87 mph (122.09 km/h) |
| 70 mph (112.65 km/h) | 81.7 mph (131.49 km/h) |
| 75 mph (120.7 km/h) | 87.54 mph (140.88 km/h) |
| 80 mph (128.75 km/h) | 93.37 mph (150.27 km/h) |
| 85 mph (136.79 km/h) | 99.21 mph (159.66 km/h) |
| 90 mph (144.84 km/h) | 105.05 mph (169.05 km/h) |
| 95 mph (152.89 km/h) | 110.88 mph (178.45 km/h) |
| 100 mph (160.93 km/h) | 116.72 mph (187.84 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1386 | 1610 | 1734 | 1811 | 1893 | 1952 | 2017 | 2094 | 2200 | 2306 | 2424 | 2518 | 2689 | 2878 | 3025 | 3120 | 3173 | 3368 | 3639 | 4229 |
Better Fuel Economy Factory Ratios Increased Power
