Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/40-23 | 380/40-23 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.61 (828.2) | 34.97 (888.2) | 2.36 (60) 7.2% |
| Width inches (mm) | 12.01 (305) | 14.96 (380) | 2.95 (75) 24.6% |
| Circum. inches (mm) | 102.44 (2601.87) | 109.86 (2790.36) | 7.42 (188.5) 7.2% |
| Sidewall Height inches (mm) | 4.8 (122) | 5.98 (152) | 1.18 (30) 24.6% |
| Revolutions per mile (km) | 618.53 (384.34) | 576.75 (358.38) | -41.78 (-25.96) -6.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.45 mph (34.52 km/h) |
| 25 mph (40.23 km/h) | 26.81 mph (43.15 km/h) |
| 30 mph (48.28 km/h) | 32.17 mph (51.78 km/h) |
| 35 mph (56.33 km/h) | 37.54 mph (60.41 km/h) |
| 40 mph (64.37 km/h) | 42.9 mph (69.04 km/h) |
| 45 mph (72.42 km/h) | 48.26 mph (77.67 km/h) |
| 50 mph (80.47 km/h) | 53.62 mph (86.3 km/h) |
| 55 mph (88.51 km/h) | 58.98 mph (94.93 km/h) |
| 60 mph (96.56 km/h) | 64.35 mph (103.56 km/h) |
| 65 mph (104.61 km/h) | 69.71 mph (112.19 km/h) |
| 70 mph (112.65 km/h) | 75.07 mph (120.82 km/h) |
| 75 mph (120.7 km/h) | 80.43 mph (129.45 km/h) |
| 80 mph (128.75 km/h) | 85.8 mph (138.08 km/h) |
| 85 mph (136.79 km/h) | 91.16 mph (146.7 km/h) |
| 90 mph (144.84 km/h) | 96.52 mph (155.33 km/h) |
| 95 mph (152.89 km/h) | 101.88 mph (163.96 km/h) |
| 100 mph (160.93 km/h) | 107.24 mph (172.59 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1468 | 1705 | 1836 | 1917 | 2005 | 2067 | 2136 | 2217 | 2330 | 2442 | 2567 | 2667 | 2848 | 3048 | 3204 | 3304 | 3360 | 3566 | 3854 | 4478 |
Better Fuel Economy Factory Ratios Increased Power
