Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/60-18 | 325/60-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 33.35 (847.2) | 35.35 (898) | 2 (50.8) 6% |
| Width inches (mm) | 12.8 (325) | 12.8 (325) | 0 (0) 0% |
| Circum. inches (mm) | 104.79 (2661.56) | 111.07 (2821.15) | 6.28 (159.59) 6% |
| Sidewall Height inches (mm) | 7.68 (195) | 7.68 (195) | 0 (0) 0% |
| Revolutions per mile (km) | 604.66 (375.72) | 570.46 (354.46) | -34.21 (-21.25) -5.7% |
325/60-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.2 mph (34.12 km/h) |
| 25 mph (40.23 km/h) | 26.5 mph (42.65 km/h) |
| 30 mph (48.28 km/h) | 31.8 mph (51.18 km/h) |
| 35 mph (56.33 km/h) | 37.1 mph (59.7 km/h) |
| 40 mph (64.37 km/h) | 42.4 mph (68.23 km/h) |
| 45 mph (72.42 km/h) | 47.7 mph (76.76 km/h) |
| 50 mph (80.47 km/h) | 53 mph (85.29 km/h) |
| 55 mph (88.51 km/h) | 58.3 mph (93.82 km/h) |
| 60 mph (96.56 km/h) | 63.6 mph (102.35 km/h) |
| 65 mph (104.61 km/h) | 68.9 mph (110.88 km/h) |
| 70 mph (112.65 km/h) | 74.2 mph (119.41 km/h) |
| 75 mph (120.7 km/h) | 79.5 mph (127.94 km/h) |
| 80 mph (128.75 km/h) | 84.8 mph (136.47 km/h) |
| 85 mph (136.79 km/h) | 90.1 mph (145 km/h) |
| 90 mph (144.84 km/h) | 95.4 mph (153.53 km/h) |
| 95 mph (152.89 km/h) | 100.7 mph (162.06 km/h) |
| 100 mph (160.93 km/h) | 106 mph (170.58 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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