Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/55-20 | 275/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 33.21 (843.5) | 33.16 (842.2) | -0.05 (-1.3) -0.2% |
| Width inches (mm) | 12.01 (305) | 10.83 (275) | -1.18 (-30) -9.8% |
| Circum. inches (mm) | 104.33 (2649.93) | 104.17 (2645.85) | -0.16 (-4.08) -0.2% |
| Sidewall Height inches (mm) | 6.6 (167.75) | 7.58 (192.5) | 0.97 (24.75) 14.8% |
| Revolutions per mile (km) | 607.31 (377.37) | 608.25 (377.95) | 0.94 (0.58) 0.2% |
275/70-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.97 mph (32.14 km/h) |
| 25 mph (40.23 km/h) | 24.96 mph (40.17 km/h) |
| 30 mph (48.28 km/h) | 29.95 mph (48.21 km/h) |
| 35 mph (56.33 km/h) | 34.95 mph (56.24 km/h) |
| 40 mph (64.37 km/h) | 39.94 mph (64.27 km/h) |
| 45 mph (72.42 km/h) | 44.93 mph (72.31 km/h) |
| 50 mph (80.47 km/h) | 49.92 mph (80.34 km/h) |
| 55 mph (88.51 km/h) | 54.92 mph (88.38 km/h) |
| 60 mph (96.56 km/h) | 59.91 mph (96.41 km/h) |
| 65 mph (104.61 km/h) | 64.9 mph (104.45 km/h) |
| 70 mph (112.65 km/h) | 69.89 mph (112.48 km/h) |
| 75 mph (120.7 km/h) | 74.88 mph (120.52 km/h) |
| 80 mph (128.75 km/h) | 79.88 mph (128.55 km/h) |
| 85 mph (136.79 km/h) | 84.87 mph (136.58 km/h) |
| 90 mph (144.84 km/h) | 89.86 mph (144.62 km/h) |
| 95 mph (152.89 km/h) | 94.85 mph (152.65 km/h) |
| 100 mph (160.93 km/h) | 99.85 mph (160.69 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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