Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 130/90-16 | 120/70-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.21 (640.4) | 27.61 (701.4) | 2.4 (61) 9.5% |
| Width inches (mm) | 5.12 (130) | 4.72 (120) | -0.39 (-10) -7.7% |
| Circum. inches (mm) | 79.21 (2011.88) | 86.75 (2203.51) | 7.54 (191.64) 9.5% |
| Sidewall Height inches (mm) | 4.61 (117) | 3.31 (84) | -1.3 (-33) -28.2% |
| Revolutions per mile (km) | 799.92 (497.05) | 730.35 (453.82) | -69.57 (-43.23) -8.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.91 mph (35.25 km/h) |
| 25 mph (40.23 km/h) | 27.38 mph (44.07 km/h) |
| 30 mph (48.28 km/h) | 32.86 mph (52.88 km/h) |
| 35 mph (56.33 km/h) | 38.33 mph (61.69 km/h) |
| 40 mph (64.37 km/h) | 43.81 mph (70.51 km/h) |
| 45 mph (72.42 km/h) | 49.29 mph (79.32 km/h) |
| 50 mph (80.47 km/h) | 54.76 mph (88.13 km/h) |
| 55 mph (88.51 km/h) | 60.24 mph (96.95 km/h) |
| 60 mph (96.56 km/h) | 65.72 mph (105.76 km/h) |
| 65 mph (104.61 km/h) | 71.19 mph (114.57 km/h) |
| 70 mph (112.65 km/h) | 76.67 mph (123.38 km/h) |
| 75 mph (120.7 km/h) | 82.14 mph (132.2 km/h) |
| 80 mph (128.75 km/h) | 87.62 mph (141.01 km/h) |
| 85 mph (136.79 km/h) | 93.1 mph (149.82 km/h) |
| 90 mph (144.84 km/h) | 98.57 mph (158.64 km/h) |
| 95 mph (152.89 km/h) | 104.05 mph (167.45 km/h) |
| 100 mph (160.93 km/h) | 109.53 mph (176.26 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
