Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/60-20 | 325/60-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 35.35 (898) | 33.35 (847.2) | -2 (-50.8) -5.7% |
| Width inches (mm) | 12.8 (325) | 12.8 (325) | 0 (0) 0% |
| Circum. inches (mm) | 111.07 (2821.15) | 104.79 (2661.56) | -6.28 (-159.59) -5.7% |
| Sidewall Height inches (mm) | 7.68 (195) | 7.68 (195) | 0 (0) 0% |
| Revolutions per mile (km) | 570.46 (354.46) | 604.66 (375.72) | 34.21 (21.25) 6% |
325/60-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.87 mph (30.37 km/h) |
| 25 mph (40.23 km/h) | 23.59 mph (37.96 km/h) |
| 30 mph (48.28 km/h) | 28.3 mph (45.55 km/h) |
| 35 mph (56.33 km/h) | 33.02 mph (53.14 km/h) |
| 40 mph (64.37 km/h) | 37.74 mph (60.73 km/h) |
| 45 mph (72.42 km/h) | 42.45 mph (68.32 km/h) |
| 50 mph (80.47 km/h) | 47.17 mph (75.92 km/h) |
| 55 mph (88.51 km/h) | 51.89 mph (83.51 km/h) |
| 60 mph (96.56 km/h) | 56.61 mph (91.1 km/h) |
| 65 mph (104.61 km/h) | 61.32 mph (98.69 km/h) |
| 70 mph (112.65 km/h) | 66.04 mph (106.28 km/h) |
| 75 mph (120.7 km/h) | 70.76 mph (113.87 km/h) |
| 80 mph (128.75 km/h) | 75.47 mph (121.46 km/h) |
| 85 mph (136.79 km/h) | 80.19 mph (129.06 km/h) |
| 90 mph (144.84 km/h) | 84.91 mph (136.65 km/h) |
| 95 mph (152.89 km/h) | 89.63 mph (144.24 km/h) |
| 100 mph (160.93 km/h) | 94.34 mph (151.83 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1539 | 1788 | 1925 | 2010 | 2102 | 2167 | 2239 | 2324 | 2442 | 2560 | 2691 | 2796 | 2986 | 3195 | 3359 | 3464 | 3523 | 3739 | 4040 | 4695 |
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