Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/40-23 | 420/60-24 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.61 (828.2) | 43.84 (1113.6) | 11.24 (285.4) 34.5% |
| Width inches (mm) | 12.01 (305) | 16.54 (420) | 4.53 (115) 37.7% |
| Circum. inches (mm) | 102.44 (2601.87) | 137.74 (3498.48) | 35.3 (896.61) 34.5% |
| Sidewall Height inches (mm) | 4.8 (122) | 9.92 (252) | 5.12 (130) 106.6% |
| Revolutions per mile (km) | 618.53 (384.34) | 460.01 (285.84) | -158.52 (-98.5) -25.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 26.89 mph (43.28 km/h) |
| 25 mph (40.23 km/h) | 33.62 mph (54.1 km/h) |
| 30 mph (48.28 km/h) | 40.34 mph (64.92 km/h) |
| 35 mph (56.33 km/h) | 47.06 mph (75.74 km/h) |
| 40 mph (64.37 km/h) | 53.78 mph (86.56 km/h) |
| 45 mph (72.42 km/h) | 60.51 mph (97.38 km/h) |
| 50 mph (80.47 km/h) | 67.23 mph (108.2 km/h) |
| 55 mph (88.51 km/h) | 73.95 mph (119.02 km/h) |
| 60 mph (96.56 km/h) | 80.68 mph (129.84 km/h) |
| 65 mph (104.61 km/h) | 87.4 mph (140.66 km/h) |
| 70 mph (112.65 km/h) | 94.12 mph (151.48 km/h) |
| 75 mph (120.7 km/h) | 100.85 mph (162.29 km/h) |
| 80 mph (128.75 km/h) | 107.57 mph (173.11 km/h) |
| 85 mph (136.79 km/h) | 114.29 mph (183.93 km/h) |
| 90 mph (144.84 km/h) | 121.01 mph (194.75 km/h) |
| 95 mph (152.89 km/h) | 127.74 mph (205.57 km/h) |
| 100 mph (160.93 km/h) | 134.46 mph (216.39 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1171 | 1360 | 1465 | 1529 | 1599 | 1649 | 1704 | 1768 | 1858 | 1948 | 2047 | 2127 | 2272 | 2431 | 2555 | 2635 | 2680 | 2844 | 3074 | 3572 |
Better Fuel Economy Factory Ratios Increased Power
