Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/25-21 | 235/30-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.41 (670.9) | 26.55 (674.4) | 0.14 (3.5) 0.5% |
| Width inches (mm) | 10.83 (275) | 9.25 (235) | -1.57 (-40) -14.5% |
| Circum. inches (mm) | 82.98 (2107.69) | 83.41 (2118.69) | 0.43 (11) 0.5% |
| Sidewall Height inches (mm) | 2.71 (68.75) | 2.78 (70.5) | 0.07 (1.75) 2.5% |
| Revolutions per mile (km) | 763.56 (474.45) | 759.59 (471.99) | -3.96 (-2.46) -0.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.1 mph (32.35 km/h) |
| 25 mph (40.23 km/h) | 25.13 mph (40.44 km/h) |
| 30 mph (48.28 km/h) | 30.16 mph (48.53 km/h) |
| 35 mph (56.33 km/h) | 35.18 mph (56.62 km/h) |
| 40 mph (64.37 km/h) | 40.21 mph (64.71 km/h) |
| 45 mph (72.42 km/h) | 45.23 mph (72.8 km/h) |
| 50 mph (80.47 km/h) | 50.26 mph (80.89 km/h) |
| 55 mph (88.51 km/h) | 55.29 mph (88.98 km/h) |
| 60 mph (96.56 km/h) | 60.31 mph (97.06 km/h) |
| 65 mph (104.61 km/h) | 65.34 mph (105.15 km/h) |
| 70 mph (112.65 km/h) | 70.37 mph (113.24 km/h) |
| 75 mph (120.7 km/h) | 75.39 mph (121.33 km/h) |
| 80 mph (128.75 km/h) | 80.42 mph (129.42 km/h) |
| 85 mph (136.79 km/h) | 85.44 mph (137.51 km/h) |
| 90 mph (144.84 km/h) | 90.47 mph (145.6 km/h) |
| 95 mph (152.89 km/h) | 95.5 mph (153.69 km/h) |
| 100 mph (160.93 km/h) | 100.52 mph (161.77 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1933 | 2246 | 2418 | 2525 | 2640 | 2723 | 2813 | 2920 | 3068 | 3216 | 3381 | 3512 | 3751 | 4014 | 4220 | 4351 | 4425 | 4697 | 5075 | 5898 |
Better Fuel Economy Factory Ratios Increased Power
