Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/60-20 | 37/13.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 34.88 (886) | 37.01 (940.18) | 2.13 (54.18) 6.1% |
| Width inches (mm) | 12.4 (315) | 13.5 (343) | 1.1 (28) 8.9% |
| Circum. inches (mm) | 109.58 (2783.45) | 116.29 (2953.66) | 6.7 (170.21) 6.1% |
| Sidewall Height inches (mm) | 7.44 (189) | 8.51 (216.09) | 1.07 (27.09) 14.3% |
| Revolutions per mile (km) | 578.18 (359.27) | 544.86 (338.56) | -33.32 (-20.7) -5.8% |
37/13.5-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.22 mph (34.16 km/h) |
| 25 mph (40.23 km/h) | 26.53 mph (42.69 km/h) |
| 30 mph (48.28 km/h) | 31.83 mph (51.23 km/h) |
| 35 mph (56.33 km/h) | 37.14 mph (59.77 km/h) |
| 40 mph (64.37 km/h) | 42.45 mph (68.31 km/h) |
| 45 mph (72.42 km/h) | 47.75 mph (76.85 km/h) |
| 50 mph (80.47 km/h) | 53.06 mph (85.39 km/h) |
| 55 mph (88.51 km/h) | 58.36 mph (93.93 km/h) |
| 60 mph (96.56 km/h) | 63.67 mph (102.47 km/h) |
| 65 mph (104.61 km/h) | 68.97 mph (111 km/h) |
| 70 mph (112.65 km/h) | 74.28 mph (119.54 km/h) |
| 75 mph (120.7 km/h) | 79.59 mph (128.08 km/h) |
| 80 mph (128.75 km/h) | 84.89 mph (136.62 km/h) |
| 85 mph (136.79 km/h) | 90.2 mph (145.16 km/h) |
| 90 mph (144.84 km/h) | 95.5 mph (153.7 km/h) |
| 95 mph (152.89 km/h) | 100.81 mph (162.24 km/h) |
| 100 mph (160.93 km/h) | 106.12 mph (170.78 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 |
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