Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/70-18 | 37/12.5-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 33.71 (856.2) | 37.03 (940.6) | 3.32 (84.4) 9.9% |
| Width inches (mm) | 11.22 (285) | 12.52 (318) | 1.3 (33) 11.6% |
| Circum. inches (mm) | 105.9 (2689.83) | 116.34 (2954.98) | 10.44 (265.15) 9.9% |
| Sidewall Height inches (mm) | 7.85 (199.5) | 10.02 (254.4) | 2.16 (54.9) 27.5% |
| Revolutions per mile (km) | 598.31 (371.77) | 544.62 (338.41) | -53.69 (-33.36) -9% |
37/12.5-17 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.97 mph (35.36 km/h) |
| 25 mph (40.23 km/h) | 27.46 mph (44.2 km/h) |
| 30 mph (48.28 km/h) | 32.96 mph (53.04 km/h) |
| 35 mph (56.33 km/h) | 38.45 mph (61.88 km/h) |
| 40 mph (64.37 km/h) | 43.94 mph (70.72 km/h) |
| 45 mph (72.42 km/h) | 49.44 mph (79.56 km/h) |
| 50 mph (80.47 km/h) | 54.93 mph (88.4 km/h) |
| 55 mph (88.51 km/h) | 60.42 mph (97.24 km/h) |
| 60 mph (96.56 km/h) | 65.91 mph (106.08 km/h) |
| 65 mph (104.61 km/h) | 71.41 mph (114.92 km/h) |
| 70 mph (112.65 km/h) | 76.9 mph (123.76 km/h) |
| 75 mph (120.7 km/h) | 82.39 mph (132.6 km/h) |
| 80 mph (128.75 km/h) | 87.89 mph (141.44 km/h) |
| 85 mph (136.79 km/h) | 93.38 mph (150.28 km/h) |
| 90 mph (144.84 km/h) | 98.87 mph (159.12 km/h) |
| 95 mph (152.89 km/h) | 104.36 mph (167.96 km/h) |
| 100 mph (160.93 km/h) | 109.86 mph (176.8 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1386 | 1610 | 1734 | 1811 | 1893 | 1952 | 2017 | 2094 | 2200 | 2306 | 2424 | 2518 | 2689 | 2878 | 3026 | 3120 | 3173 | 3368 | 3639 | 4229 |
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