Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/40-23 | 320/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.61 (828.2) | 35.64 (905.2) | 3.03 (77) 9.3% |
| Width inches (mm) | 12.01 (305) | 12.6 (320) | 0.59 (15) 4.9% |
| Circum. inches (mm) | 102.44 (2601.87) | 111.96 (2843.77) | 9.52 (241.9) 9.3% |
| Sidewall Height inches (mm) | 4.8 (122) | 8.82 (224) | 4.02 (102) 83.6% |
| Revolutions per mile (km) | 618.53 (384.34) | 565.92 (351.65) | -52.62 (-32.69) -8.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.86 mph (35.18 km/h) |
| 25 mph (40.23 km/h) | 27.32 mph (43.97 km/h) |
| 30 mph (48.28 km/h) | 32.79 mph (52.77 km/h) |
| 35 mph (56.33 km/h) | 38.25 mph (61.56 km/h) |
| 40 mph (64.37 km/h) | 43.72 mph (70.36 km/h) |
| 45 mph (72.42 km/h) | 49.18 mph (79.15 km/h) |
| 50 mph (80.47 km/h) | 54.65 mph (87.95 km/h) |
| 55 mph (88.51 km/h) | 60.11 mph (96.74 km/h) |
| 60 mph (96.56 km/h) | 65.58 mph (105.54 km/h) |
| 65 mph (104.61 km/h) | 71.04 mph (114.33 km/h) |
| 70 mph (112.65 km/h) | 76.51 mph (123.13 km/h) |
| 75 mph (120.7 km/h) | 81.97 mph (131.92 km/h) |
| 80 mph (128.75 km/h) | 87.44 mph (140.72 km/h) |
| 85 mph (136.79 km/h) | 92.9 mph (149.51 km/h) |
| 90 mph (144.84 km/h) | 98.37 mph (158.31 km/h) |
| 95 mph (152.89 km/h) | 103.83 mph (167.1 km/h) |
| 100 mph (160.93 km/h) | 109.3 mph (175.9 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1440 | 1673 | 1802 | 1881 | 1967 | 2028 | 2096 | 2176 | 2286 | 2396 | 2519 | 2617 | 2795 | 2991 | 3144 | 3242 | 3297 | 3499 | 3781 | 4394 |
Better Fuel Economy Factory Ratios Increased Power
