Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/30-21 | 275/25-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.79 (680.4) | 26.41 (670.9) | -0.37 (-9.5) -1.4% |
| Width inches (mm) | 9.65 (245) | 10.83 (275) | 1.18 (30) 12.2% |
| Circum. inches (mm) | 84.16 (2137.54) | 82.98 (2107.69) | -1.18 (-29.85) -1.4% |
| Sidewall Height inches (mm) | 2.89 (73.5) | 2.71 (68.75) | -0.19 (-4.75) -6.5% |
| Revolutions per mile (km) | 752.9 (467.83) | 763.56 (474.45) | 10.66 (6.62) 1.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.72 mph (31.74 km/h) |
| 25 mph (40.23 km/h) | 24.65 mph (39.67 km/h) |
| 30 mph (48.28 km/h) | 29.58 mph (47.61 km/h) |
| 35 mph (56.33 km/h) | 34.51 mph (55.54 km/h) |
| 40 mph (64.37 km/h) | 39.44 mph (63.48 km/h) |
| 45 mph (72.42 km/h) | 44.37 mph (71.41 km/h) |
| 50 mph (80.47 km/h) | 49.3 mph (79.34 km/h) |
| 55 mph (88.51 km/h) | 54.23 mph (87.28 km/h) |
| 60 mph (96.56 km/h) | 59.16 mph (95.21 km/h) |
| 65 mph (104.61 km/h) | 64.09 mph (103.15 km/h) |
| 70 mph (112.65 km/h) | 69.02 mph (111.08 km/h) |
| 75 mph (120.7 km/h) | 73.95 mph (119.02 km/h) |
| 80 mph (128.75 km/h) | 78.88 mph (126.95 km/h) |
| 85 mph (136.79 km/h) | 83.81 mph (134.88 km/h) |
| 90 mph (144.84 km/h) | 88.74 mph (142.82 km/h) |
| 95 mph (152.89 km/h) | 93.67 mph (150.75 km/h) |
| 100 mph (160.93 km/h) | 98.6 mph (158.69 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
