Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/50-21 | 275/40-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.04 (788.4) | 29.66 (753.4) | -1.38 (-35) -4.4% |
| Width inches (mm) | 10.04 (255) | 10.83 (275) | 0.79 (20) 7.8% |
| Circum. inches (mm) | 97.51 (2476.83) | 93.18 (2366.88) | -4.33 (-109.96) -4.4% |
| Sidewall Height inches (mm) | 5.02 (127.5) | 4.33 (110) | -0.69 (-17.5) -13.7% |
| Revolutions per mile (km) | 649.76 (403.74) | 679.94 (422.5) | 30.19 (18.76) 4.6% |
275/40-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.11 mph (30.76 km/h) |
| 25 mph (40.23 km/h) | 23.89 mph (38.45 km/h) |
| 30 mph (48.28 km/h) | 28.67 mph (46.14 km/h) |
| 35 mph (56.33 km/h) | 33.45 mph (53.83 km/h) |
| 40 mph (64.37 km/h) | 38.22 mph (61.52 km/h) |
| 45 mph (72.42 km/h) | 43 mph (69.21 km/h) |
| 50 mph (80.47 km/h) | 47.78 mph (76.9 km/h) |
| 55 mph (88.51 km/h) | 52.56 mph (84.58 km/h) |
| 60 mph (96.56 km/h) | 57.34 mph (92.27 km/h) |
| 65 mph (104.61 km/h) | 62.11 mph (99.96 km/h) |
| 70 mph (112.65 km/h) | 66.89 mph (107.65 km/h) |
| 75 mph (120.7 km/h) | 71.67 mph (115.34 km/h) |
| 80 mph (128.75 km/h) | 76.45 mph (123.03 km/h) |
| 85 mph (136.79 km/h) | 81.23 mph (130.72 km/h) |
| 90 mph (144.84 km/h) | 86 mph (138.41 km/h) |
| 95 mph (152.89 km/h) | 90.78 mph (146.1 km/h) |
| 100 mph (160.93 km/h) | 95.56 mph (153.79 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1730 | 2010 | 2165 | 2260 | 2364 | 2437 | 2518 | 2614 | 2746 | 2879 | 3026 | 3144 | 3358 | 3593 | 3777 | 3895 | 3961 | 4204 | 4543 | 5279 |
Better Fuel Economy Factory Ratios Increased Power
