Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/40-21 | 275/55-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.66 (753.4) | 32.91 (835.9) | 3.25 (82.5) 11% |
| Width inches (mm) | 10.83 (275) | 10.83 (275) | 0 (0) 0% |
| Circum. inches (mm) | 93.18 (2366.88) | 103.39 (2626.06) | 10.2 (259.18) 11% |
| Sidewall Height inches (mm) | 4.33 (110) | 5.95 (151.25) | 1.62 (41.25) 37.5% |
| Revolutions per mile (km) | 679.94 (422.5) | 612.84 (380.8) | -67.11 (-41.7) -9.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.19 mph (35.71 km/h) |
| 25 mph (40.23 km/h) | 27.74 mph (44.64 km/h) |
| 30 mph (48.28 km/h) | 33.29 mph (53.57 km/h) |
| 35 mph (56.33 km/h) | 38.83 mph (62.5 km/h) |
| 40 mph (64.37 km/h) | 44.38 mph (71.42 km/h) |
| 45 mph (72.42 km/h) | 49.93 mph (80.35 km/h) |
| 50 mph (80.47 km/h) | 55.48 mph (89.28 km/h) |
| 55 mph (88.51 km/h) | 61.02 mph (98.21 km/h) |
| 60 mph (96.56 km/h) | 66.57 mph (107.13 km/h) |
| 65 mph (104.61 km/h) | 72.12 mph (116.06 km/h) |
| 70 mph (112.65 km/h) | 77.67 mph (124.99 km/h) |
| 75 mph (120.7 km/h) | 83.21 mph (133.92 km/h) |
| 80 mph (128.75 km/h) | 88.76 mph (142.85 km/h) |
| 85 mph (136.79 km/h) | 94.31 mph (151.77 km/h) |
| 90 mph (144.84 km/h) | 99.86 mph (160.7 km/h) |
| 95 mph (152.89 km/h) | 105.4 mph (169.63 km/h) |
| 100 mph (160.93 km/h) | 110.95 mph (178.56 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1560 | 1812 | 1951 | 2037 | 2130 | 2197 | 2270 | 2356 | 2475 | 2595 | 2728 | 2834 | 3026 | 3239 | 3404 | 3511 | 3570 | 3789 | 4095 | 4758 |
Better Fuel Economy Factory Ratios Increased Power
