Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 295/30-21 | 400/20-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.97 (710.4) | 27.3 (693.4) | -0.67 (-17) -2.4% |
| Width inches (mm) | 11.61 (295) | 15.75 (400) | 4.13 (105) 35.6% |
| Circum. inches (mm) | 87.87 (2231.79) | 85.76 (2178.38) | -2.1 (-53.41) -2.4% |
| Sidewall Height inches (mm) | 3.48 (88.5) | 3.15 (80) | -0.33 (-8.5) -9.6% |
| Revolutions per mile (km) | 721.1 (448.07) | 738.78 (459.06) | 17.68 (10.99) 2.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.52 mph (31.42 km/h) |
| 25 mph (40.23 km/h) | 24.4 mph (39.27 km/h) |
| 30 mph (48.28 km/h) | 29.28 mph (47.13 km/h) |
| 35 mph (56.33 km/h) | 34.16 mph (54.98 km/h) |
| 40 mph (64.37 km/h) | 39.04 mph (62.83 km/h) |
| 45 mph (72.42 km/h) | 43.92 mph (70.69 km/h) |
| 50 mph (80.47 km/h) | 48.8 mph (78.54 km/h) |
| 55 mph (88.51 km/h) | 53.68 mph (86.4 km/h) |
| 60 mph (96.56 km/h) | 58.56 mph (94.25 km/h) |
| 65 mph (104.61 km/h) | 63.44 mph (102.1 km/h) |
| 70 mph (112.65 km/h) | 68.32 mph (109.96 km/h) |
| 75 mph (120.7 km/h) | 73.21 mph (117.81 km/h) |
| 80 mph (128.75 km/h) | 78.09 mph (125.67 km/h) |
| 85 mph (136.79 km/h) | 82.97 mph (133.52 km/h) |
| 90 mph (144.84 km/h) | 87.85 mph (141.38 km/h) |
| 95 mph (152.89 km/h) | 92.73 mph (149.23 km/h) |
| 100 mph (160.93 km/h) | 97.61 mph (157.08 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1880 | 2184 | 2352 | 2456 | 2568 | 2648 | 2736 | 2840 | 2984 | 3128 | 3288 | 3416 | 3648 | 3904 | 4104 | 4232 | 4304 | 4568 | 4936 | 5736 |
Better Fuel Economy Factory Ratios Increased Power
