Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/70-18 | 275/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 35.91 (912.2) | 33.16 (842.2) | -2.76 (-70) -7.7% |
| Width inches (mm) | 12.8 (325) | 10.83 (275) | -1.97 (-50) -15.4% |
| Circum. inches (mm) | 112.83 (2865.76) | 104.17 (2645.85) | -8.66 (-219.91) -7.7% |
| Sidewall Height inches (mm) | 8.96 (227.5) | 7.58 (192.5) | -1.38 (-35) -15.4% |
| Revolutions per mile (km) | 561.58 (348.95) | 608.25 (377.95) | 46.68 (29) 8.3% |
275/70-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.47 mph (29.72 km/h) |
| 25 mph (40.23 km/h) | 23.08 mph (37.15 km/h) |
| 30 mph (48.28 km/h) | 27.7 mph (44.58 km/h) |
| 35 mph (56.33 km/h) | 32.31 mph (52 km/h) |
| 40 mph (64.37 km/h) | 36.93 mph (59.43 km/h) |
| 45 mph (72.42 km/h) | 41.55 mph (66.86 km/h) |
| 50 mph (80.47 km/h) | 46.16 mph (74.29 km/h) |
| 55 mph (88.51 km/h) | 50.78 mph (81.72 km/h) |
| 60 mph (96.56 km/h) | 55.4 mph (89.15 km/h) |
| 65 mph (104.61 km/h) | 60.01 mph (96.58 km/h) |
| 70 mph (112.65 km/h) | 64.63 mph (104.01 km/h) |
| 75 mph (120.7 km/h) | 69.24 mph (111.44 km/h) |
| 80 mph (128.75 km/h) | 73.86 mph (118.87 km/h) |
| 85 mph (136.79 km/h) | 78.48 mph (126.3 km/h) |
| 90 mph (144.84 km/h) | 83.09 mph (133.73 km/h) |
| 95 mph (152.89 km/h) | 87.71 mph (141.16 km/h) |
| 100 mph (160.93 km/h) | 92.33 mph (148.58 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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