Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/40-21 | 250/40-19 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.03 (737.4) | 26.87 (682.6) | -2.16 (-54.8) -7.4% |
| Width inches (mm) | 10.04 (255) | 9.84 (250) | -0.2 (-5) -2% |
| Circum. inches (mm) | 91.21 (2316.61) | 84.43 (2144.45) | -6.78 (-172.16) -7.4% |
| Sidewall Height inches (mm) | 4.02 (102) | 3.94 (100) | -0.08 (-2) -2% |
| Revolutions per mile (km) | 694.7 (431.66) | 750.47 (466.32) | 55.77 (34.65) 8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.51 mph (29.79 km/h) |
| 25 mph (40.23 km/h) | 23.14 mph (37.24 km/h) |
| 30 mph (48.28 km/h) | 27.77 mph (44.69 km/h) |
| 35 mph (56.33 km/h) | 32.4 mph (52.14 km/h) |
| 40 mph (64.37 km/h) | 37.03 mph (59.59 km/h) |
| 45 mph (72.42 km/h) | 41.66 mph (67.04 km/h) |
| 50 mph (80.47 km/h) | 46.28 mph (74.49 km/h) |
| 55 mph (88.51 km/h) | 50.91 mph (81.94 km/h) |
| 60 mph (96.56 km/h) | 55.54 mph (89.38 km/h) |
| 65 mph (104.61 km/h) | 60.17 mph (96.83 km/h) |
| 70 mph (112.65 km/h) | 64.8 mph (104.28 km/h) |
| 75 mph (120.7 km/h) | 69.43 mph (111.73 km/h) |
| 80 mph (128.75 km/h) | 74.05 mph (119.18 km/h) |
| 85 mph (136.79 km/h) | 78.68 mph (126.63 km/h) |
| 90 mph (144.84 km/h) | 83.31 mph (134.08 km/h) |
| 95 mph (152.89 km/h) | 87.94 mph (141.53 km/h) |
| 100 mph (160.93 km/h) | 92.57 mph (148.97 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1910 | 2219 | 2389 | 2495 | 2609 | 2690 | 2779 | 2885 | 3031 | 3178 | 3340 | 3470 | 3706 | 3966 | 4169 | 4299 | 4372 | 4640 | 5014 | 5827 |
Better Fuel Economy Factory Ratios Increased Power
