Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/65-16 | 325/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.52 (698.9) | 34.63 (879.7) | 7.12 (180.8) 25.9% |
| Width inches (mm) | 8.86 (225) | 12.8 (325) | 3.94 (100) 44.4% |
| Circum. inches (mm) | 86.44 (2195.66) | 108.81 (2763.66) | 22.36 (568) 25.9% |
| Sidewall Height inches (mm) | 5.76 (146.25) | 8.32 (211.25) | 2.56 (65) 44.4% |
| Revolutions per mile (km) | 732.97 (455.44) | 582.32 (361.84) | -150.64 (-93.6) -20.6% |
325/65-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 25.17 mph (40.51 km/h) |
| 25 mph (40.23 km/h) | 31.47 mph (50.64 km/h) |
| 30 mph (48.28 km/h) | 37.76 mph (60.77 km/h) |
| 35 mph (56.33 km/h) | 44.05 mph (70.9 km/h) |
| 40 mph (64.37 km/h) | 50.35 mph (81.03 km/h) |
| 45 mph (72.42 km/h) | 56.64 mph (91.16 km/h) |
| 50 mph (80.47 km/h) | 62.93 mph (101.28 km/h) |
| 55 mph (88.51 km/h) | 69.23 mph (111.41 km/h) |
| 60 mph (96.56 km/h) | 75.52 mph (121.54 km/h) |
| 65 mph (104.61 km/h) | 81.81 mph (131.67 km/h) |
| 70 mph (112.65 km/h) | 88.11 mph (141.8 km/h) |
| 75 mph (120.7 km/h) | 94.4 mph (151.93 km/h) |
| 80 mph (128.75 km/h) | 100.7 mph (162.05 km/h) |
| 85 mph (136.79 km/h) | 106.99 mph (172.18 km/h) |
| 90 mph (144.84 km/h) | 113.28 mph (182.31 km/h) |
| 95 mph (152.89 km/h) | 119.58 mph (192.44 km/h) |
| 100 mph (160.93 km/h) | 125.87 mph (202.57 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1482 | 1722 | 1854 | 1936 | 2024 | 2087 | 2157 | 2239 | 2352 | 2466 | 2592 | 2693 | 2876 | 3077 | 3235 | 3336 | 3393 | 3601 | 3891 | 4521 |
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