Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 37/13.5-20 | 325/60-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.01 (940.18) | 35.35 (898) | -1.66 (-42.18) -4.5% |
| Width inches (mm) | 13.5 (343) | 12.8 (325) | -0.71 (-18) -5.2% |
| Circum. inches (mm) | 116.29 (2953.66) | 111.07 (2821.15) | -5.22 (-132.51) -4.5% |
| Sidewall Height inches (mm) | 8.51 (216.09) | 7.68 (195) | -0.83 (-21.09) -9.8% |
| Revolutions per mile (km) | 544.86 (338.56) | 570.46 (354.46) | 25.59 (15.9) 4.7% |
325/60-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.1 mph (30.74 km/h) |
| 25 mph (40.23 km/h) | 23.88 mph (38.43 km/h) |
| 30 mph (48.28 km/h) | 28.65 mph (46.11 km/h) |
| 35 mph (56.33 km/h) | 33.43 mph (53.8 km/h) |
| 40 mph (64.37 km/h) | 38.21 mph (61.49 km/h) |
| 45 mph (72.42 km/h) | 42.98 mph (69.17 km/h) |
| 50 mph (80.47 km/h) | 47.76 mph (76.86 km/h) |
| 55 mph (88.51 km/h) | 52.53 mph (84.54 km/h) |
| 60 mph (96.56 km/h) | 57.31 mph (92.23 km/h) |
| 65 mph (104.61 km/h) | 62.08 mph (99.91 km/h) |
| 70 mph (112.65 km/h) | 66.86 mph (107.6 km/h) |
| 75 mph (120.7 km/h) | 71.64 mph (115.29 km/h) |
| 80 mph (128.75 km/h) | 76.41 mph (122.97 km/h) |
| 85 mph (136.79 km/h) | 81.19 mph (130.66 km/h) |
| 90 mph (144.84 km/h) | 85.96 mph (138.34 km/h) |
| 95 mph (152.89 km/h) | 90.74 mph (146.03 km/h) |
| 100 mph (160.93 km/h) | 95.51 mph (153.71 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1452 | 1686 | 1816 | 1896 | 1983 | 2045 | 2113 | 2193 | 2304 | 2415 | 2539 | 2638 | 2817 | 3015 | 3169 | 3268 | 3323 | 3527 | 3811 | 4429 |
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