Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/25-21 | 245/30-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.41 (670.9) | 26.79 (680.4) | 0.37 (9.5) 1.4% |
| Width inches (mm) | 10.83 (275) | 9.65 (245) | -1.18 (-30) -10.9% |
| Circum. inches (mm) | 82.98 (2107.69) | 84.16 (2137.54) | 1.18 (29.85) 1.4% |
| Sidewall Height inches (mm) | 2.71 (68.75) | 2.89 (73.5) | 0.19 (4.75) 6.9% |
| Revolutions per mile (km) | 763.56 (474.45) | 752.9 (467.83) | -10.66 (-6.62) -1.4% |
245/30-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.28 mph (32.64 km/h) |
| 25 mph (40.23 km/h) | 25.35 mph (40.8 km/h) |
| 30 mph (48.28 km/h) | 30.42 mph (48.96 km/h) |
| 35 mph (56.33 km/h) | 35.5 mph (57.12 km/h) |
| 40 mph (64.37 km/h) | 40.57 mph (65.29 km/h) |
| 45 mph (72.42 km/h) | 45.64 mph (73.45 km/h) |
| 50 mph (80.47 km/h) | 50.71 mph (81.61 km/h) |
| 55 mph (88.51 km/h) | 55.78 mph (89.77 km/h) |
| 60 mph (96.56 km/h) | 60.85 mph (97.93 km/h) |
| 65 mph (104.61 km/h) | 65.92 mph (106.09 km/h) |
| 70 mph (112.65 km/h) | 70.99 mph (114.25 km/h) |
| 75 mph (120.7 km/h) | 76.06 mph (122.41 km/h) |
| 80 mph (128.75 km/h) | 81.13 mph (130.57 km/h) |
| 85 mph (136.79 km/h) | 86.2 mph (138.73 km/h) |
| 90 mph (144.84 km/h) | 91.27 mph (146.89 km/h) |
| 95 mph (152.89 km/h) | 96.35 mph (155.05 km/h) |
| 100 mph (160.93 km/h) | 101.42 mph (163.21 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1916 | 2226 | 2397 | 2503 | 2617 | 2699 | 2788 | 2894 | 3041 | 3188 | 3351 | 3481 | 3718 | 3979 | 4183 | 4313 | 4386 | 4655 | 5030 | 5846 |
Better Fuel Economy Factory Ratios Increased Power
