Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/45-21 | 275/40-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.68 (753.9) | 29.66 (753.4) | -0.02 (-0.5) -0.1% |
| Width inches (mm) | 9.65 (245) | 10.83 (275) | 1.18 (30) 12.2% |
| Circum. inches (mm) | 93.25 (2368.45) | 93.18 (2366.88) | -0.06 (-1.57) -0.1% |
| Sidewall Height inches (mm) | 4.34 (110.25) | 4.33 (110) | -0.01 (-0.25) -0.2% |
| Revolutions per mile (km) | 679.49 (422.22) | 679.94 (422.5) | 0.45 (0.28) 0.1% |
275/40-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.99 mph (32.17 km/h) |
| 25 mph (40.23 km/h) | 24.98 mph (40.21 km/h) |
| 30 mph (48.28 km/h) | 29.98 mph (48.25 km/h) |
| 35 mph (56.33 km/h) | 34.98 mph (56.29 km/h) |
| 40 mph (64.37 km/h) | 39.97 mph (64.33 km/h) |
| 45 mph (72.42 km/h) | 44.97 mph (72.37 km/h) |
| 50 mph (80.47 km/h) | 49.97 mph (80.41 km/h) |
| 55 mph (88.51 km/h) | 54.96 mph (88.46 km/h) |
| 60 mph (96.56 km/h) | 59.96 mph (96.5 km/h) |
| 65 mph (104.61 km/h) | 64.96 mph (104.54 km/h) |
| 70 mph (112.65 km/h) | 69.95 mph (112.58 km/h) |
| 75 mph (120.7 km/h) | 74.95 mph (120.62 km/h) |
| 80 mph (128.75 km/h) | 79.95 mph (128.66 km/h) |
| 85 mph (136.79 km/h) | 84.94 mph (136.7 km/h) |
| 90 mph (144.84 km/h) | 89.94 mph (144.75 km/h) |
| 95 mph (152.89 km/h) | 94.94 mph (152.79 km/h) |
| 100 mph (160.93 km/h) | 99.93 mph (160.83 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
