Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/65-18 | 305/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 34.63 (879.7) | 33.61 (853.7) | -1.02 (-26) -3% |
| Width inches (mm) | 12.8 (325) | 12.01 (305) | -0.79 (-20) -6.2% |
| Circum. inches (mm) | 108.81 (2763.66) | 105.59 (2681.98) | -3.22 (-81.68) -3% |
| Sidewall Height inches (mm) | 8.32 (211.25) | 7.81 (198.25) | -0.51 (-13) -6.2% |
| Revolutions per mile (km) | 582.32 (361.84) | 600.06 (372.86) | 17.74 (11.02) 3% |
305/65-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.41 mph (31.24 km/h) |
| 25 mph (40.23 km/h) | 24.26 mph (39.04 km/h) |
| 30 mph (48.28 km/h) | 29.11 mph (46.85 km/h) |
| 35 mph (56.33 km/h) | 33.97 mph (54.66 km/h) |
| 40 mph (64.37 km/h) | 38.82 mph (62.47 km/h) |
| 45 mph (72.42 km/h) | 43.67 mph (70.28 km/h) |
| 50 mph (80.47 km/h) | 48.52 mph (78.09 km/h) |
| 55 mph (88.51 km/h) | 53.37 mph (85.9 km/h) |
| 60 mph (96.56 km/h) | 58.23 mph (93.71 km/h) |
| 65 mph (104.61 km/h) | 63.08 mph (101.52 km/h) |
| 70 mph (112.65 km/h) | 67.93 mph (109.32 km/h) |
| 75 mph (120.7 km/h) | 72.78 mph (117.13 km/h) |
| 80 mph (128.75 km/h) | 77.64 mph (124.94 km/h) |
| 85 mph (136.79 km/h) | 82.49 mph (132.75 km/h) |
| 90 mph (144.84 km/h) | 87.34 mph (140.56 km/h) |
| 95 mph (152.89 km/h) | 92.19 mph (148.37 km/h) |
| 100 mph (160.93 km/h) | 97.04 mph (156.18 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1527 | 1774 | 1910 | 1995 | 2086 | 2151 | 2222 | 2307 | 2424 | 2541 | 2671 | 2775 | 2963 | 3171 | 3333 | 3437 | 3496 | 3710 | 4009 | 4659 |
Better Fuel Economy Factory Ratios Increased Power
