Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/40-21 | 250/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.66 (753.4) | 29.84 (758) | 0.18 (4.6) 0.6% |
| Width inches (mm) | 10.83 (275) | 9.84 (250) | -0.98 (-25) -9.1% |
| Circum. inches (mm) | 93.18 (2366.88) | 93.75 (2381.33) | 0.57 (14.45) 0.6% |
| Sidewall Height inches (mm) | 4.33 (110) | 4.92 (125) | 0.59 (15) 13.6% |
| Revolutions per mile (km) | 679.94 (422.5) | 675.82 (419.93) | -4.13 (-2.56) -0.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.12 mph (32.38 km/h) |
| 25 mph (40.23 km/h) | 25.15 mph (40.48 km/h) |
| 30 mph (48.28 km/h) | 30.18 mph (48.58 km/h) |
| 35 mph (56.33 km/h) | 35.21 mph (56.67 km/h) |
| 40 mph (64.37 km/h) | 40.24 mph (64.77 km/h) |
| 45 mph (72.42 km/h) | 45.27 mph (72.86 km/h) |
| 50 mph (80.47 km/h) | 50.31 mph (80.96 km/h) |
| 55 mph (88.51 km/h) | 55.34 mph (89.05 km/h) |
| 60 mph (96.56 km/h) | 60.37 mph (97.15 km/h) |
| 65 mph (104.61 km/h) | 65.4 mph (105.25 km/h) |
| 70 mph (112.65 km/h) | 70.43 mph (113.34 km/h) |
| 75 mph (120.7 km/h) | 75.46 mph (121.44 km/h) |
| 80 mph (128.75 km/h) | 80.49 mph (129.53 km/h) |
| 85 mph (136.79 km/h) | 85.52 mph (137.63 km/h) |
| 90 mph (144.84 km/h) | 90.55 mph (145.73 km/h) |
| 95 mph (152.89 km/h) | 95.58 mph (153.82 km/h) |
| 100 mph (160.93 km/h) | 100.61 mph (161.92 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1720 | 1998 | 2152 | 2247 | 2349 | 2422 | 2503 | 2598 | 2730 | 2862 | 3008 | 3125 | 3337 | 3571 | 3754 | 3871 | 3937 | 4179 | 4515 | 5247 |
Better Fuel Economy Factory Ratios Increased Power
