Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/70-21 | 130/60-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.61 (701.4) | 27.14 (689.4) | -0.47 (-12) -1.7% |
| Width inches (mm) | 4.72 (120) | 5.12 (130) | 0.39 (10) 8.3% |
| Circum. inches (mm) | 86.75 (2203.51) | 85.27 (2165.81) | -1.48 (-37.7) -1.7% |
| Sidewall Height inches (mm) | 3.31 (84) | 3.07 (78) | -0.24 (-6) -7.1% |
| Revolutions per mile (km) | 730.35 (453.82) | 743.07 (461.72) | 12.71 (7.9) 1.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.66 mph (31.64 km/h) |
| 25 mph (40.23 km/h) | 24.57 mph (39.55 km/h) |
| 30 mph (48.28 km/h) | 29.49 mph (47.45 km/h) |
| 35 mph (56.33 km/h) | 34.4 mph (55.36 km/h) |
| 40 mph (64.37 km/h) | 39.32 mph (63.27 km/h) |
| 45 mph (72.42 km/h) | 44.23 mph (71.18 km/h) |
| 50 mph (80.47 km/h) | 49.14 mph (79.09 km/h) |
| 55 mph (88.51 km/h) | 54.06 mph (87 km/h) |
| 60 mph (96.56 km/h) | 58.97 mph (94.91 km/h) |
| 65 mph (104.61 km/h) | 63.89 mph (102.82 km/h) |
| 70 mph (112.65 km/h) | 68.8 mph (110.73 km/h) |
| 75 mph (120.7 km/h) | 73.72 mph (118.64 km/h) |
| 80 mph (128.75 km/h) | 78.63 mph (126.55 km/h) |
| 85 mph (136.79 km/h) | 83.55 mph (134.45 km/h) |
| 90 mph (144.84 km/h) | 88.46 mph (142.36 km/h) |
| 95 mph (152.89 km/h) | 93.37 mph (150.27 km/h) |
| 100 mph (160.93 km/h) | 98.29 mph (158.18 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1891 | 2197 | 2366 | 2470 | 2583 | 2663 | 2752 | 2857 | 3001 | 3146 | 3307 | 3436 | 3669 | 3927 | 4128 | 4257 | 4329 | 4595 | 4965 | 5769 |
Better Fuel Economy Factory Ratios Increased Power
