Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 130/60-21 | 180/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.14 (689.4) | 25.8 (655.2) | -1.35 (-34.2) -5% |
| Width inches (mm) | 5.12 (130) | 7.09 (180) | 1.97 (50) 38.5% |
| Circum. inches (mm) | 85.27 (2165.81) | 81.04 (2058.37) | -4.23 (-107.44) -5% |
| Sidewall Height inches (mm) | 3.07 (78) | 3.9 (99) | 0.83 (21) 26.9% |
| Revolutions per mile (km) | 743.07 (461.72) | 781.85 (485.82) | 38.79 (24.1) 5.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.01 mph (30.59 km/h) |
| 25 mph (40.23 km/h) | 23.76 mph (38.24 km/h) |
| 30 mph (48.28 km/h) | 28.51 mph (45.89 km/h) |
| 35 mph (56.33 km/h) | 33.26 mph (53.53 km/h) |
| 40 mph (64.37 km/h) | 38.02 mph (61.18 km/h) |
| 45 mph (72.42 km/h) | 42.77 mph (68.83 km/h) |
| 50 mph (80.47 km/h) | 47.52 mph (76.48 km/h) |
| 55 mph (88.51 km/h) | 52.27 mph (84.12 km/h) |
| 60 mph (96.56 km/h) | 57.02 mph (91.77 km/h) |
| 65 mph (104.61 km/h) | 61.78 mph (99.42 km/h) |
| 70 mph (112.65 km/h) | 66.53 mph (107.07 km/h) |
| 75 mph (120.7 km/h) | 71.28 mph (114.71 km/h) |
| 80 mph (128.75 km/h) | 76.03 mph (122.36 km/h) |
| 85 mph (136.79 km/h) | 80.78 mph (130.01 km/h) |
| 90 mph (144.84 km/h) | 85.54 mph (137.66 km/h) |
| 95 mph (152.89 km/h) | 90.29 mph (145.3 km/h) |
| 100 mph (160.93 km/h) | 95.04 mph (152.95 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1990 | 2311 | 2489 | 2599 | 2718 | 2802 | 2896 | 3006 | 3158 | 3310 | 3480 | 3615 | 3861 | 4132 | 4343 | 4479 | 4555 | 4834 | 5224 | 6071 |
Better Fuel Economy Factory Ratios Increased Power
