Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/40-23 | 420/85-24 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.61 (828.2) | 52.11 (1323.6) | 19.5 (495.4) 59.8% |
| Width inches (mm) | 12.01 (305) | 16.54 (420) | 4.53 (115) 37.7% |
| Circum. inches (mm) | 102.44 (2601.87) | 163.71 (4158.21) | 61.27 (1556.35) 59.8% |
| Sidewall Height inches (mm) | 4.8 (122) | 14.06 (357) | 9.25 (235) 192.6% |
| Revolutions per mile (km) | 618.53 (384.34) | 387.03 (240.49) | -231.51 (-143.85) -37.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 31.96 mph (51.44 km/h) |
| 25 mph (40.23 km/h) | 39.95 mph (64.3 km/h) |
| 30 mph (48.28 km/h) | 47.94 mph (77.16 km/h) |
| 35 mph (56.33 km/h) | 55.94 mph (90.02 km/h) |
| 40 mph (64.37 km/h) | 63.93 mph (102.88 km/h) |
| 45 mph (72.42 km/h) | 71.92 mph (115.74 km/h) |
| 50 mph (80.47 km/h) | 79.91 mph (128.6 km/h) |
| 55 mph (88.51 km/h) | 87.9 mph (141.46 km/h) |
| 60 mph (96.56 km/h) | 95.89 mph (154.32 km/h) |
| 65 mph (104.61 km/h) | 103.88 mph (167.18 km/h) |
| 70 mph (112.65 km/h) | 111.87 mph (180.04 km/h) |
| 75 mph (120.7 km/h) | 119.86 mph (192.9 km/h) |
| 80 mph (128.75 km/h) | 127.85 mph (205.76 km/h) |
| 85 mph (136.79 km/h) | 135.84 mph (218.62 km/h) |
| 90 mph (144.84 km/h) | 143.83 mph (231.48 km/h) |
| 95 mph (152.89 km/h) | 151.83 mph (244.34 km/h) |
| 100 mph (160.93 km/h) | 159.82 mph (257.2 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Better Fuel Economy Factory Ratios Increased Power
