Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 265/70-18 | 325/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.61 (828.2) | 34.63 (879.7) | 2.03 (51.5) 6.2% |
| Width inches (mm) | 10.43 (265) | 12.8 (325) | 2.36 (60) 22.6% |
| Circum. inches (mm) | 102.44 (2601.87) | 108.81 (2763.66) | 6.37 (161.79) 6.2% |
| Sidewall Height inches (mm) | 7.3 (185.5) | 8.32 (211.25) | 1.01 (25.75) 13.9% |
| Revolutions per mile (km) | 618.53 (384.34) | 582.32 (361.84) | -36.21 (-22.5) -5.9% |
325/65-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.24 mph (34.19 km/h) |
| 25 mph (40.23 km/h) | 26.55 mph (42.74 km/h) |
| 30 mph (48.28 km/h) | 31.87 mph (51.28 km/h) |
| 35 mph (56.33 km/h) | 37.18 mph (59.83 km/h) |
| 40 mph (64.37 km/h) | 42.49 mph (68.38 km/h) |
| 45 mph (72.42 km/h) | 47.8 mph (76.92 km/h) |
| 50 mph (80.47 km/h) | 53.11 mph (85.47 km/h) |
| 55 mph (88.51 km/h) | 58.42 mph (94.02 km/h) |
| 60 mph (96.56 km/h) | 63.73 mph (102.57 km/h) |
| 65 mph (104.61 km/h) | 69.04 mph (111.11 km/h) |
| 70 mph (112.65 km/h) | 74.35 mph (119.66 km/h) |
| 75 mph (120.7 km/h) | 79.66 mph (128.21 km/h) |
| 80 mph (128.75 km/h) | 84.97 mph (136.75 km/h) |
| 85 mph (136.79 km/h) | 90.29 mph (145.3 km/h) |
| 90 mph (144.84 km/h) | 95.6 mph (153.85 km/h) |
| 95 mph (152.89 km/h) | 100.91 mph (162.4 km/h) |
| 100 mph (160.93 km/h) | 106.22 mph (170.94 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 |
Better Fuel Economy Factory Ratios Increased Power
