Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 130/60-21 | 120/90-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.14 (689.4) | 29.5 (749.4) | 2.36 (60) 8.7% |
| Width inches (mm) | 5.12 (130) | 4.72 (120) | -0.39 (-10) -7.7% |
| Circum. inches (mm) | 85.27 (2165.81) | 92.69 (2354.31) | 7.42 (188.5) 8.7% |
| Sidewall Height inches (mm) | 3.07 (78) | 4.25 (108) | 1.18 (30) 38.5% |
| Revolutions per mile (km) | 743.07 (461.72) | 683.57 (424.75) | -59.49 (-36.97) -8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.74 mph (34.99 km/h) |
| 25 mph (40.23 km/h) | 27.18 mph (43.74 km/h) |
| 30 mph (48.28 km/h) | 32.61 mph (52.48 km/h) |
| 35 mph (56.33 km/h) | 38.05 mph (61.23 km/h) |
| 40 mph (64.37 km/h) | 43.48 mph (69.98 km/h) |
| 45 mph (72.42 km/h) | 48.92 mph (78.72 km/h) |
| 50 mph (80.47 km/h) | 54.35 mph (87.47 km/h) |
| 55 mph (88.51 km/h) | 59.79 mph (96.22 km/h) |
| 60 mph (96.56 km/h) | 65.22 mph (104.96 km/h) |
| 65 mph (104.61 km/h) | 70.66 mph (113.71 km/h) |
| 70 mph (112.65 km/h) | 76.09 mph (122.46 km/h) |
| 75 mph (120.7 km/h) | 81.53 mph (131.21 km/h) |
| 80 mph (128.75 km/h) | 86.96 mph (139.95 km/h) |
| 85 mph (136.79 km/h) | 92.4 mph (148.7 km/h) |
| 90 mph (144.84 km/h) | 97.83 mph (157.45 km/h) |
| 95 mph (152.89 km/h) | 103.27 mph (166.19 km/h) |
| 100 mph (160.93 km/h) | 108.7 mph (174.94 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1740 | 2021 | 2176 | 2273 | 2376 | 2450 | 2532 | 2628 | 2761 | 2894 | 3042 | 3161 | 3375 | 3612 | 3797 | 3916 | 3982 | 4227 | 4567 | 5308 |
Better Fuel Economy Factory Ratios Increased Power
