Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/30-21 | 275/25-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.5 (698.4) | 26.41 (670.9) | -1.08 (-27.5) -3.9% |
| Width inches (mm) | 10.83 (275) | 10.83 (275) | 0 (0) 0% |
| Circum. inches (mm) | 86.38 (2194.09) | 82.98 (2107.69) | -3.4 (-86.39) -3.9% |
| Sidewall Height inches (mm) | 3.25 (82.5) | 2.71 (68.75) | -0.54 (-13.75) -16.7% |
| Revolutions per mile (km) | 733.49 (455.77) | 763.56 (474.45) | 30.07 (18.68) 4.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.21 mph (30.92 km/h) |
| 25 mph (40.23 km/h) | 24.02 mph (38.65 km/h) |
| 30 mph (48.28 km/h) | 28.82 mph (46.38 km/h) |
| 35 mph (56.33 km/h) | 33.62 mph (54.11 km/h) |
| 40 mph (64.37 km/h) | 38.42 mph (61.84 km/h) |
| 45 mph (72.42 km/h) | 43.23 mph (69.57 km/h) |
| 50 mph (80.47 km/h) | 48.03 mph (77.3 km/h) |
| 55 mph (88.51 km/h) | 52.83 mph (85.03 km/h) |
| 60 mph (96.56 km/h) | 57.64 mph (92.76 km/h) |
| 65 mph (104.61 km/h) | 62.44 mph (100.49 km/h) |
| 70 mph (112.65 km/h) | 67.24 mph (108.22 km/h) |
| 75 mph (120.7 km/h) | 72.05 mph (115.95 km/h) |
| 80 mph (128.75 km/h) | 76.85 mph (123.68 km/h) |
| 85 mph (136.79 km/h) | 81.65 mph (131.41 km/h) |
| 90 mph (144.84 km/h) | 86.46 mph (139.14 km/h) |
| 95 mph (152.89 km/h) | 91.26 mph (146.87 km/h) |
| 100 mph (160.93 km/h) | 96.06 mph (154.6 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1943 | 2257 | 2431 | 2538 | 2654 | 2737 | 2828 | 2935 | 3084 | 3233 | 3398 | 3531 | 3770 | 4035 | 4242 | 4374 | 4448 | 4721 | 5102 | 5929 |
Better Fuel Economy Factory Ratios Increased Power
