Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/40-18 | 255/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.24 (717.2) | 29.04 (737.7) | 0.81 (20.5) 2.9% |
| Width inches (mm) | 12.8 (325) | 10.04 (255) | -2.76 (-70) -21.5% |
| Circum. inches (mm) | 88.71 (2253.15) | 91.24 (2317.55) | 2.54 (64.4) 2.9% |
| Sidewall Height inches (mm) | 5.12 (130) | 5.52 (140.25) | 0.4 (10.25) 7.9% |
| Revolutions per mile (km) | 714.26 (443.82) | 694.42 (431.49) | -19.85 (-12.33) -2.8% |
255/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.57 mph (33.11 km/h) |
| 25 mph (40.23 km/h) | 25.71 mph (41.38 km/h) |
| 30 mph (48.28 km/h) | 30.86 mph (49.66 km/h) |
| 35 mph (56.33 km/h) | 36 mph (57.94 km/h) |
| 40 mph (64.37 km/h) | 41.14 mph (66.21 km/h) |
| 45 mph (72.42 km/h) | 46.29 mph (74.49 km/h) |
| 50 mph (80.47 km/h) | 51.43 mph (82.77 km/h) |
| 55 mph (88.51 km/h) | 56.57 mph (91.04 km/h) |
| 60 mph (96.56 km/h) | 61.72 mph (99.32 km/h) |
| 65 mph (104.61 km/h) | 66.86 mph (107.6 km/h) |
| 70 mph (112.65 km/h) | 72 mph (115.87 km/h) |
| 75 mph (120.7 km/h) | 77.14 mph (124.15 km/h) |
| 80 mph (128.75 km/h) | 82.29 mph (132.43 km/h) |
| 85 mph (136.79 km/h) | 87.43 mph (140.7 km/h) |
| 90 mph (144.84 km/h) | 92.57 mph (148.98 km/h) |
| 95 mph (152.89 km/h) | 97.72 mph (157.26 km/h) |
| 100 mph (160.93 km/h) | 102.86 mph (165.53 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1767 | 2053 | 2211 | 2309 | 2414 | 2489 | 2572 | 2670 | 2805 | 2940 | 3091 | 3211 | 3429 | 3670 | 3858 | 3978 | 4046 | 4294 | 4640 | 5392 |
Better Fuel Economy Factory Ratios Increased Power
