Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/70-21 | 130/70-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.61 (701.4) | 28.17 (715.4) | 0.55 (14) 2% |
| Width inches (mm) | 4.72 (120) | 5.12 (130) | 0.39 (10) 8.3% |
| Circum. inches (mm) | 86.75 (2203.51) | 88.48 (2247.5) | 1.73 (43.98) 2% |
| Sidewall Height inches (mm) | 3.31 (84) | 3.58 (91) | 0.28 (7) 8.3% |
| Revolutions per mile (km) | 730.35 (453.82) | 716.06 (444.94) | -14.29 (-8.88) -2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.4 mph (32.83 km/h) |
| 25 mph (40.23 km/h) | 25.5 mph (41.04 km/h) |
| 30 mph (48.28 km/h) | 30.6 mph (49.24 km/h) |
| 35 mph (56.33 km/h) | 35.7 mph (57.45 km/h) |
| 40 mph (64.37 km/h) | 40.8 mph (65.66 km/h) |
| 45 mph (72.42 km/h) | 45.9 mph (73.87 km/h) |
| 50 mph (80.47 km/h) | 51 mph (82.07 km/h) |
| 55 mph (88.51 km/h) | 56.1 mph (90.28 km/h) |
| 60 mph (96.56 km/h) | 61.2 mph (98.49 km/h) |
| 65 mph (104.61 km/h) | 66.3 mph (106.7 km/h) |
| 70 mph (112.65 km/h) | 71.4 mph (114.9 km/h) |
| 75 mph (120.7 km/h) | 76.5 mph (123.11 km/h) |
| 80 mph (128.75 km/h) | 81.6 mph (131.32 km/h) |
| 85 mph (136.79 km/h) | 86.7 mph (139.52 km/h) |
| 90 mph (144.84 km/h) | 91.8 mph (147.73 km/h) |
| 95 mph (152.89 km/h) | 96.9 mph (155.94 km/h) |
| 100 mph (160.93 km/h) | 102 mph (164.15 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1822 | 2117 | 2280 | 2381 | 2489 | 2567 | 2652 | 2753 | 2892 | 3032 | 3187 | 3311 | 3536 | 3784 | 3978 | 4102 | 4172 | 4428 | 4784 | 5560 |
Better Fuel Economy Factory Ratios Increased Power
