Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 33/12.5-18 | 275/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 33.02 (838.8) | 32.07 (814.7) | -0.95 (-24.1) -2.9% |
| Width inches (mm) | 12.52 (318) | 10.83 (275) | -1.69 (-43) -13.5% |
| Circum. inches (mm) | 103.75 (2635.17) | 100.77 (2559.46) | -2.98 (-75.71) -2.9% |
| Sidewall Height inches (mm) | 7.51 (190.8) | 7.04 (178.75) | -0.47 (-12.05) -6.3% |
| Revolutions per mile (km) | 610.72 (379.48) | 628.78 (390.71) | 18.07 (11.23) 3% |
275/65-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.43 mph (31.26 km/h) |
| 25 mph (40.23 km/h) | 24.28 mph (39.08 km/h) |
| 30 mph (48.28 km/h) | 29.14 mph (46.89 km/h) |
| 35 mph (56.33 km/h) | 33.99 mph (54.71 km/h) |
| 40 mph (64.37 km/h) | 38.85 mph (62.52 km/h) |
| 45 mph (72.42 km/h) | 43.71 mph (70.34 km/h) |
| 50 mph (80.47 km/h) | 48.56 mph (78.16 km/h) |
| 55 mph (88.51 km/h) | 53.42 mph (85.97 km/h) |
| 60 mph (96.56 km/h) | 58.28 mph (93.79 km/h) |
| 65 mph (104.61 km/h) | 63.13 mph (101.6 km/h) |
| 70 mph (112.65 km/h) | 67.99 mph (109.42 km/h) |
| 75 mph (120.7 km/h) | 72.85 mph (117.23 km/h) |
| 80 mph (128.75 km/h) | 77.7 mph (125.05 km/h) |
| 85 mph (136.79 km/h) | 82.56 mph (132.86 km/h) |
| 90 mph (144.84 km/h) | 87.41 mph (140.68 km/h) |
| 95 mph (152.89 km/h) | 92.27 mph (148.5 km/h) |
| 100 mph (160.93 km/h) | 97.13 mph (156.31 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
