Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/80-20 | 275/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.32 (948) | 33.16 (842.2) | -4.17 (-105.8) -11.2% |
| Width inches (mm) | 10.83 (275) | 10.83 (275) | 0 (0) 0% |
| Circum. inches (mm) | 117.25 (2978.23) | 104.17 (2645.85) | -13.09 (-332.38) -11.2% |
| Sidewall Height inches (mm) | 8.66 (220) | 7.58 (192.5) | -1.08 (-27.5) -12.5% |
| Revolutions per mile (km) | 540.37 (335.77) | 608.25 (377.95) | 67.88 (42.18) 12.6% |
275/70-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.77 mph (28.59 km/h) |
| 25 mph (40.23 km/h) | 22.21 mph (35.74 km/h) |
| 30 mph (48.28 km/h) | 26.65 mph (42.89 km/h) |
| 35 mph (56.33 km/h) | 31.09 mph (50.04 km/h) |
| 40 mph (64.37 km/h) | 35.54 mph (57.19 km/h) |
| 45 mph (72.42 km/h) | 39.98 mph (64.34 km/h) |
| 50 mph (80.47 km/h) | 44.42 mph (71.49 km/h) |
| 55 mph (88.51 km/h) | 48.86 mph (78.64 km/h) |
| 60 mph (96.56 km/h) | 53.3 mph (85.78 km/h) |
| 65 mph (104.61 km/h) | 57.75 mph (92.93 km/h) |
| 70 mph (112.65 km/h) | 62.19 mph (100.08 km/h) |
| 75 mph (120.7 km/h) | 66.63 mph (107.23 km/h) |
| 80 mph (128.75 km/h) | 71.07 mph (114.38 km/h) |
| 85 mph (136.79 km/h) | 75.51 mph (121.53 km/h) |
| 90 mph (144.84 km/h) | 79.96 mph (128.68 km/h) |
| 95 mph (152.89 km/h) | 84.4 mph (135.83 km/h) |
| 100 mph (160.93 km/h) | 88.84 mph (142.97 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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