Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/40-21 | 305/35-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.66 (753.4) | 29.41 (746.9) | -0.26 (-6.5) -0.9% |
| Width inches (mm) | 10.83 (275) | 12.01 (305) | 1.18 (30) 10.9% |
| Circum. inches (mm) | 93.18 (2366.88) | 92.38 (2346.46) | -0.8 (-20.42) -0.9% |
| Sidewall Height inches (mm) | 4.33 (110) | 4.2 (106.75) | -0.13 (-3.25) -3% |
| Revolutions per mile (km) | 679.94 (422.5) | 685.86 (426.17) | 5.92 (3.68) 0.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.83 mph (31.91 km/h) |
| 25 mph (40.23 km/h) | 24.78 mph (39.89 km/h) |
| 30 mph (48.28 km/h) | 29.74 mph (47.86 km/h) |
| 35 mph (56.33 km/h) | 34.7 mph (55.84 km/h) |
| 40 mph (64.37 km/h) | 39.65 mph (63.82 km/h) |
| 45 mph (72.42 km/h) | 44.61 mph (71.8 km/h) |
| 50 mph (80.47 km/h) | 49.57 mph (79.77 km/h) |
| 55 mph (88.51 km/h) | 54.53 mph (87.75 km/h) |
| 60 mph (96.56 km/h) | 59.48 mph (95.73 km/h) |
| 65 mph (104.61 km/h) | 64.44 mph (103.71 km/h) |
| 70 mph (112.65 km/h) | 69.4 mph (111.68 km/h) |
| 75 mph (120.7 km/h) | 74.35 mph (119.66 km/h) |
| 80 mph (128.75 km/h) | 79.31 mph (127.64 km/h) |
| 85 mph (136.79 km/h) | 84.27 mph (135.61 km/h) |
| 90 mph (144.84 km/h) | 89.22 mph (143.59 km/h) |
| 95 mph (152.89 km/h) | 94.18 mph (151.57 km/h) |
| 100 mph (160.93 km/h) | 99.14 mph (159.55 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1745 | 2028 | 2184 | 2280 | 2384 | 2458 | 2540 | 2637 | 2770 | 2904 | 3053 | 3171 | 3387 | 3624 | 3810 | 3929 | 3996 | 4241 | 4583 | 5325 |
Better Fuel Economy Factory Ratios Increased Power
