Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/40-18 | 305/58-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.24 (717.2) | 28.93 (734.8) | 0.69 (17.6) 2.5% |
| Width inches (mm) | 12.8 (325) | 12.01 (305) | -0.79 (-20) -6.2% |
| Circum. inches (mm) | 88.71 (2253.15) | 90.88 (2308.44) | 2.18 (55.29) 2.5% |
| Sidewall Height inches (mm) | 5.12 (130) | 6.96 (176.9) | 1.85 (46.9) 36.1% |
| Revolutions per mile (km) | 714.26 (443.82) | 697.16 (433.19) | -17.11 (-10.63) -2.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.49 mph (32.98 km/h) |
| 25 mph (40.23 km/h) | 25.61 mph (41.22 km/h) |
| 30 mph (48.28 km/h) | 30.74 mph (49.47 km/h) |
| 35 mph (56.33 km/h) | 35.86 mph (57.71 km/h) |
| 40 mph (64.37 km/h) | 40.98 mph (65.95 km/h) |
| 45 mph (72.42 km/h) | 46.1 mph (74.2 km/h) |
| 50 mph (80.47 km/h) | 51.23 mph (82.44 km/h) |
| 55 mph (88.51 km/h) | 56.35 mph (90.69 km/h) |
| 60 mph (96.56 km/h) | 61.47 mph (98.93 km/h) |
| 65 mph (104.61 km/h) | 66.6 mph (107.17 km/h) |
| 70 mph (112.65 km/h) | 71.72 mph (115.42 km/h) |
| 75 mph (120.7 km/h) | 76.84 mph (123.66 km/h) |
| 80 mph (128.75 km/h) | 81.96 mph (131.91 km/h) |
| 85 mph (136.79 km/h) | 87.09 mph (140.15 km/h) |
| 90 mph (144.84 km/h) | 92.21 mph (148.4 km/h) |
| 95 mph (152.89 km/h) | 97.33 mph (156.64 km/h) |
| 100 mph (160.93 km/h) | 102.45 mph (164.88 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1774 | 2061 | 2220 | 2318 | 2423 | 2499 | 2582 | 2680 | 2816 | 2952 | 3103 | 3224 | 3443 | 3684 | 3873 | 3994 | 4062 | 4311 | 4658 | 5413 |
Better Fuel Economy Factory Ratios Increased Power
