Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 130/80-16 | 120/70-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.19 (614.4) | 27.61 (701.4) | 3.43 (87) 14.2% |
| Width inches (mm) | 5.12 (130) | 4.72 (120) | -0.39 (-10) -7.7% |
| Circum. inches (mm) | 75.99 (1930.19) | 86.75 (2203.51) | 10.76 (273.32) 14.2% |
| Sidewall Height inches (mm) | 4.09 (104) | 3.31 (84) | -0.79 (-20) -19.2% |
| Revolutions per mile (km) | 833.77 (518.08) | 730.35 (453.82) | -103.42 (-64.26) -12.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.83 mph (36.74 km/h) |
| 25 mph (40.23 km/h) | 28.54 mph (45.93 km/h) |
| 30 mph (48.28 km/h) | 34.25 mph (55.12 km/h) |
| 35 mph (56.33 km/h) | 39.96 mph (64.3 km/h) |
| 40 mph (64.37 km/h) | 45.66 mph (73.49 km/h) |
| 45 mph (72.42 km/h) | 51.37 mph (82.68 km/h) |
| 50 mph (80.47 km/h) | 57.08 mph (91.86 km/h) |
| 55 mph (88.51 km/h) | 62.79 mph (101.05 km/h) |
| 60 mph (96.56 km/h) | 68.5 mph (110.23 km/h) |
| 65 mph (104.61 km/h) | 74.2 mph (119.42 km/h) |
| 70 mph (112.65 km/h) | 79.91 mph (128.61 km/h) |
| 75 mph (120.7 km/h) | 85.62 mph (137.79 km/h) |
| 80 mph (128.75 km/h) | 91.33 mph (146.98 km/h) |
| 85 mph (136.79 km/h) | 97.04 mph (156.16 km/h) |
| 90 mph (144.84 km/h) | 102.74 mph (165.35 km/h) |
| 95 mph (152.89 km/h) | 108.45 mph (174.54 km/h) |
| 100 mph (160.93 km/h) | 114.16 mph (183.72 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1859 | 2159 | 2325 | 2428 | 2539 | 2618 | 2705 | 2808 | 2950 | 3092 | 3251 | 3377 | 3606 | 3860 | 4057 | 4184 | 4255 | 4516 | 4880 | 5671 |
Better Fuel Economy Factory Ratios Increased Power
