Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/40-18 | 325/60-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.24 (717.2) | 33.35 (847.2) | 5.12 (130) 18.1% |
| Width inches (mm) | 12.8 (325) | 12.8 (325) | 0 (0) 0% |
| Circum. inches (mm) | 88.71 (2253.15) | 104.79 (2661.56) | 16.08 (408.41) 18.1% |
| Sidewall Height inches (mm) | 5.12 (130) | 7.68 (195) | 2.56 (65) 50% |
| Revolutions per mile (km) | 714.26 (443.82) | 604.66 (375.72) | -109.6 (-68.1) -15.3% |
325/60-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.63 mph (38.02 km/h) |
| 25 mph (40.23 km/h) | 29.53 mph (47.53 km/h) |
| 30 mph (48.28 km/h) | 35.44 mph (57.03 km/h) |
| 35 mph (56.33 km/h) | 41.34 mph (66.54 km/h) |
| 40 mph (64.37 km/h) | 47.25 mph (76.04 km/h) |
| 45 mph (72.42 km/h) | 53.16 mph (85.55 km/h) |
| 50 mph (80.47 km/h) | 59.06 mph (95.05 km/h) |
| 55 mph (88.51 km/h) | 64.97 mph (104.56 km/h) |
| 60 mph (96.56 km/h) | 70.88 mph (114.06 km/h) |
| 65 mph (104.61 km/h) | 76.78 mph (123.57 km/h) |
| 70 mph (112.65 km/h) | 82.69 mph (133.07 km/h) |
| 75 mph (120.7 km/h) | 88.59 mph (142.58 km/h) |
| 80 mph (128.75 km/h) | 94.5 mph (152.08 km/h) |
| 85 mph (136.79 km/h) | 100.41 mph (161.59 km/h) |
| 90 mph (144.84 km/h) | 106.31 mph (171.1 km/h) |
| 95 mph (152.89 km/h) | 112.22 mph (180.6 km/h) |
| 100 mph (160.93 km/h) | 118.13 mph (190.11 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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