Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 31/12.5-17 | 275/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.02 (787.96) | 33.16 (842.2) | 2.14 (54.24) 6.9% |
| Width inches (mm) | 12.52 (318) | 10.83 (275) | -1.69 (-43) -13.5% |
| Circum. inches (mm) | 97.46 (2475.45) | 104.17 (2645.85) | 6.71 (170.4) 6.9% |
| Sidewall Height inches (mm) | 7.01 (178.08) | 7.58 (192.5) | 0.57 (14.42) 8.1% |
| Revolutions per mile (km) | 650.12 (403.97) | 608.25 (377.95) | -41.87 (-26.02) -6.4% |
275/70-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.38 mph (34.4 km/h) |
| 25 mph (40.23 km/h) | 26.72 mph (43 km/h) |
| 30 mph (48.28 km/h) | 32.07 mph (51.6 km/h) |
| 35 mph (56.33 km/h) | 37.41 mph (60.2 km/h) |
| 40 mph (64.37 km/h) | 42.75 mph (68.81 km/h) |
| 45 mph (72.42 km/h) | 48.1 mph (77.41 km/h) |
| 50 mph (80.47 km/h) | 53.44 mph (86.01 km/h) |
| 55 mph (88.51 km/h) | 58.79 mph (94.61 km/h) |
| 60 mph (96.56 km/h) | 64.13 mph (103.21 km/h) |
| 65 mph (104.61 km/h) | 69.47 mph (111.81 km/h) |
| 70 mph (112.65 km/h) | 74.82 mph (120.41 km/h) |
| 75 mph (120.7 km/h) | 80.16 mph (129.01 km/h) |
| 80 mph (128.75 km/h) | 85.51 mph (137.61 km/h) |
| 85 mph (136.79 km/h) | 90.85 mph (146.21 km/h) |
| 90 mph (144.84 km/h) | 96.2 mph (154.81 km/h) |
| 95 mph (152.89 km/h) | 101.54 mph (163.41 km/h) |
| 100 mph (160.93 km/h) | 106.88 mph (172.01 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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