Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/55-18 | 215/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.8 (655.2) | 29.31 (744.5) | 3.52 (89.3) 13.6% |
| Width inches (mm) | 7.09 (180) | 8.46 (215) | 1.38 (35) 19.4% |
| Circum. inches (mm) | 81.04 (2058.37) | 92.08 (2338.92) | 11.05 (280.54) 13.6% |
| Sidewall Height inches (mm) | 3.9 (99) | 4.66 (118.25) | 0.76 (19.25) 19.4% |
| Revolutions per mile (km) | 781.85 (485.82) | 688.07 (427.55) | -93.78 (-58.27) -12% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.73 mph (36.57 km/h) |
| 25 mph (40.23 km/h) | 28.41 mph (45.72 km/h) |
| 30 mph (48.28 km/h) | 34.09 mph (54.86 km/h) |
| 35 mph (56.33 km/h) | 39.77 mph (64 km/h) |
| 40 mph (64.37 km/h) | 45.45 mph (73.15 km/h) |
| 45 mph (72.42 km/h) | 51.13 mph (82.29 km/h) |
| 50 mph (80.47 km/h) | 56.81 mph (91.43 km/h) |
| 55 mph (88.51 km/h) | 62.5 mph (100.58 km/h) |
| 60 mph (96.56 km/h) | 68.18 mph (109.72 km/h) |
| 65 mph (104.61 km/h) | 73.86 mph (118.86 km/h) |
| 70 mph (112.65 km/h) | 79.54 mph (128.01 km/h) |
| 75 mph (120.7 km/h) | 85.22 mph (137.15 km/h) |
| 80 mph (128.75 km/h) | 90.9 mph (146.3 km/h) |
| 85 mph (136.79 km/h) | 96.59 mph (155.44 km/h) |
| 90 mph (144.84 km/h) | 102.27 mph (164.58 km/h) |
| 95 mph (152.89 km/h) | 107.95 mph (173.73 km/h) |
| 100 mph (160.93 km/h) | 113.63 mph (182.87 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1751 | 2034 | 2191 | 2287 | 2392 | 2466 | 2548 | 2645 | 2779 | 2913 | 3062 | 3182 | 3398 | 3636 | 3822 | 3942 | 4009 | 4255 | 4597 | 5342 |
Better Fuel Economy Factory Ratios Increased Power
