Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/80-15 | 275/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 35.47 (901) | 32.07 (814.7) | -3.4 (-86.3) -9.6% |
| Width inches (mm) | 12.8 (325) | 10.83 (275) | -1.97 (-50) -15.4% |
| Circum. inches (mm) | 111.44 (2830.57) | 100.77 (2559.46) | -10.67 (-271.12) -9.6% |
| Sidewall Height inches (mm) | 10.24 (260) | 7.04 (178.75) | -3.2 (-81.25) -31.3% |
| Revolutions per mile (km) | 568.56 (353.28) | 628.78 (390.71) | 60.23 (37.42) 10.6% |
275/65-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.08 mph (29.1 km/h) |
| 25 mph (40.23 km/h) | 22.61 mph (36.38 km/h) |
| 30 mph (48.28 km/h) | 27.13 mph (43.66 km/h) |
| 35 mph (56.33 km/h) | 31.65 mph (50.93 km/h) |
| 40 mph (64.37 km/h) | 36.17 mph (58.21 km/h) |
| 45 mph (72.42 km/h) | 40.69 mph (65.48 km/h) |
| 50 mph (80.47 km/h) | 45.21 mph (72.76 km/h) |
| 55 mph (88.51 km/h) | 49.73 mph (80.04 km/h) |
| 60 mph (96.56 km/h) | 54.25 mph (87.31 km/h) |
| 65 mph (104.61 km/h) | 58.77 mph (94.59 km/h) |
| 70 mph (112.65 km/h) | 63.3 mph (101.86 km/h) |
| 75 mph (120.7 km/h) | 67.82 mph (109.14 km/h) |
| 80 mph (128.75 km/h) | 72.34 mph (116.42 km/h) |
| 85 mph (136.79 km/h) | 76.86 mph (123.69 km/h) |
| 90 mph (144.84 km/h) | 81.38 mph (130.97 km/h) |
| 95 mph (152.89 km/h) | 85.9 mph (138.24 km/h) |
| 100 mph (160.93 km/h) | 90.42 mph (145.52 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1600 | 1859 | 2002 | 2090 | 2186 | 2254 | 2329 | 2417 | 2540 | 2662 | 2799 | 2907 | 3105 | 3323 | 3493 | 3602 | 3663 | 3888 | 4201 | 4882 |
Better Fuel Economy Factory Ratios Increased Power
