Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 265/66-17 | 320/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.77 (781.6) | 35.64 (905.2) | 4.87 (123.6) 15.8% |
| Width inches (mm) | 10.43 (265) | 12.6 (320) | 2.17 (55) 20.8% |
| Circum. inches (mm) | 96.67 (2455.47) | 111.96 (2843.77) | 15.29 (388.3) 15.8% |
| Sidewall Height inches (mm) | 6.89 (174.9) | 8.82 (224) | 1.93 (49.1) 28.1% |
| Revolutions per mile (km) | 655.41 (407.25) | 565.92 (351.65) | -89.49 (-55.61) -13.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.16 mph (37.28 km/h) |
| 25 mph (40.23 km/h) | 28.95 mph (46.6 km/h) |
| 30 mph (48.28 km/h) | 34.74 mph (55.92 km/h) |
| 35 mph (56.33 km/h) | 40.53 mph (65.23 km/h) |
| 40 mph (64.37 km/h) | 46.33 mph (74.55 km/h) |
| 45 mph (72.42 km/h) | 52.12 mph (83.87 km/h) |
| 50 mph (80.47 km/h) | 57.91 mph (93.19 km/h) |
| 55 mph (88.51 km/h) | 63.7 mph (102.51 km/h) |
| 60 mph (96.56 km/h) | 69.49 mph (111.83 km/h) |
| 65 mph (104.61 km/h) | 75.28 mph (121.15 km/h) |
| 70 mph (112.65 km/h) | 81.07 mph (130.47 km/h) |
| 75 mph (120.7 km/h) | 86.86 mph (139.79 km/h) |
| 80 mph (128.75 km/h) | 92.65 mph (149.11 km/h) |
| 85 mph (136.79 km/h) | 98.44 mph (158.43 km/h) |
| 90 mph (144.84 km/h) | 104.23 mph (167.75 km/h) |
| 95 mph (152.89 km/h) | 110.02 mph (177.07 km/h) |
| 100 mph (160.93 km/h) | 115.81 mph (186.38 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
