Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/65-18 | 275/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 34.63 (879.7) | 33.16 (842.2) | -1.48 (-37.5) -4.3% |
| Width inches (mm) | 12.8 (325) | 10.83 (275) | -1.97 (-50) -15.4% |
| Circum. inches (mm) | 108.81 (2763.66) | 104.17 (2645.85) | -4.64 (-117.81) -4.3% |
| Sidewall Height inches (mm) | 8.32 (211.25) | 7.58 (192.5) | -0.74 (-18.75) -8.9% |
| Revolutions per mile (km) | 582.32 (361.84) | 608.25 (377.95) | 25.93 (16.11) 4.5% |
275/70-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.15 mph (30.81 km/h) |
| 25 mph (40.23 km/h) | 23.93 mph (38.52 km/h) |
| 30 mph (48.28 km/h) | 28.72 mph (46.22 km/h) |
| 35 mph (56.33 km/h) | 33.51 mph (53.93 km/h) |
| 40 mph (64.37 km/h) | 38.29 mph (61.63 km/h) |
| 45 mph (72.42 km/h) | 43.08 mph (69.33 km/h) |
| 50 mph (80.47 km/h) | 47.87 mph (77.04 km/h) |
| 55 mph (88.51 km/h) | 52.66 mph (84.74 km/h) |
| 60 mph (96.56 km/h) | 57.44 mph (92.44 km/h) |
| 65 mph (104.61 km/h) | 62.23 mph (100.15 km/h) |
| 70 mph (112.65 km/h) | 67.02 mph (107.85 km/h) |
| 75 mph (120.7 km/h) | 71.8 mph (115.56 km/h) |
| 80 mph (128.75 km/h) | 76.59 mph (123.26 km/h) |
| 85 mph (136.79 km/h) | 81.38 mph (130.96 km/h) |
| 90 mph (144.84 km/h) | 86.16 mph (138.67 km/h) |
| 95 mph (152.89 km/h) | 90.95 mph (146.37 km/h) |
| 100 mph (160.93 km/h) | 95.74 mph (154.07 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1548 | 1798 | 1937 | 2022 | 2114 | 2180 | 2253 | 2338 | 2457 | 2575 | 2707 | 2813 | 3004 | 3214 | 3379 | 3484 | 3544 | 3761 | 4064 | 4723 |
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