Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/60-20 | 325/60-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 33.46 (850) | 35.35 (898) | 1.89 (48) 5.6% |
| Width inches (mm) | 11.22 (285) | 12.8 (325) | 1.57 (40) 14% |
| Circum. inches (mm) | 105.13 (2670.35) | 111.07 (2821.15) | 5.94 (150.8) 5.6% |
| Sidewall Height inches (mm) | 6.73 (171) | 7.68 (195) | 0.94 (24) 14% |
| Revolutions per mile (km) | 602.67 (374.48) | 570.46 (354.46) | -32.21 (-20.02) -5.3% |
325/60-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.13 mph (34 km/h) |
| 25 mph (40.23 km/h) | 26.41 mph (42.51 km/h) |
| 30 mph (48.28 km/h) | 31.69 mph (51.01 km/h) |
| 35 mph (56.33 km/h) | 36.98 mph (59.51 km/h) |
| 40 mph (64.37 km/h) | 42.26 mph (68.01 km/h) |
| 45 mph (72.42 km/h) | 47.54 mph (76.51 km/h) |
| 50 mph (80.47 km/h) | 52.82 mph (85.01 km/h) |
| 55 mph (88.51 km/h) | 58.11 mph (93.51 km/h) |
| 60 mph (96.56 km/h) | 63.39 mph (102.01 km/h) |
| 65 mph (104.61 km/h) | 68.67 mph (110.51 km/h) |
| 70 mph (112.65 km/h) | 73.95 mph (119.02 km/h) |
| 75 mph (120.7 km/h) | 79.24 mph (127.52 km/h) |
| 80 mph (128.75 km/h) | 84.52 mph (136.02 km/h) |
| 85 mph (136.79 km/h) | 89.8 mph (144.52 km/h) |
| 90 mph (144.84 km/h) | 95.08 mph (153.02 km/h) |
| 95 mph (152.89 km/h) | 100.36 mph (161.52 km/h) |
| 100 mph (160.93 km/h) | 105.65 mph (170.02 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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