Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/90-18 | 215/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.98 (736.2) | 27.31 (693.7) | -1.67 (-42.5) -5.8% |
| Width inches (mm) | 6.1 (155) | 8.46 (215) | 2.36 (60) 38.7% |
| Circum. inches (mm) | 91.06 (2312.84) | 85.8 (2179.32) | -5.26 (-133.52) -5.8% |
| Sidewall Height inches (mm) | 5.49 (139.5) | 4.66 (118.25) | -0.84 (-21.25) -15.2% |
| Revolutions per mile (km) | 695.83 (432.37) | 738.46 (458.86) | 42.63 (26.49) 6.1% |
215/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.85 mph (30.33 km/h) |
| 25 mph (40.23 km/h) | 23.56 mph (37.91 km/h) |
| 30 mph (48.28 km/h) | 28.27 mph (45.49 km/h) |
| 35 mph (56.33 km/h) | 32.98 mph (53.08 km/h) |
| 40 mph (64.37 km/h) | 37.69 mph (60.66 km/h) |
| 45 mph (72.42 km/h) | 42.4 mph (68.24 km/h) |
| 50 mph (80.47 km/h) | 47.11 mph (75.82 km/h) |
| 55 mph (88.51 km/h) | 51.82 mph (83.4 km/h) |
| 60 mph (96.56 km/h) | 56.54 mph (90.99 km/h) |
| 65 mph (104.61 km/h) | 61.25 mph (98.57 km/h) |
| 70 mph (112.65 km/h) | 65.96 mph (106.15 km/h) |
| 75 mph (120.7 km/h) | 70.67 mph (113.73 km/h) |
| 80 mph (128.75 km/h) | 75.38 mph (121.32 km/h) |
| 85 mph (136.79 km/h) | 80.09 mph (128.9 km/h) |
| 90 mph (144.84 km/h) | 84.8 mph (136.48 km/h) |
| 95 mph (152.89 km/h) | 89.52 mph (144.06 km/h) |
| 100 mph (160.93 km/h) | 94.23 mph (151.64 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1879 | 2183 | 2351 | 2455 | 2567 | 2647 | 2735 | 2839 | 2983 | 3127 | 3287 | 3415 | 3647 | 3902 | 4102 | 4230 | 4302 | 4566 | 4934 | 5734 |
Better Fuel Economy Factory Ratios Increased Power
