Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/30-20 | 275/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.5 (673) | 28.66 (728) | 2.17 (55) 8.2% |
| Width inches (mm) | 10.83 (275) | 10.83 (275) | 0 (0) 0% |
| Circum. inches (mm) | 83.24 (2114.29) | 90.04 (2287.08) | 6.8 (172.79) 8.2% |
| Sidewall Height inches (mm) | 3.25 (82.5) | 4.33 (110) | 1.08 (27.5) 33.3% |
| Revolutions per mile (km) | 761.17 (472.97) | 703.67 (437.24) | -57.51 (-35.73) -7.6% |
275/40-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.63 mph (34.82 km/h) |
| 25 mph (40.23 km/h) | 27.04 mph (43.52 km/h) |
| 30 mph (48.28 km/h) | 32.45 mph (52.23 km/h) |
| 35 mph (56.33 km/h) | 37.86 mph (60.93 km/h) |
| 40 mph (64.37 km/h) | 43.27 mph (69.63 km/h) |
| 45 mph (72.42 km/h) | 48.68 mph (78.34 km/h) |
| 50 mph (80.47 km/h) | 54.09 mph (87.04 km/h) |
| 55 mph (88.51 km/h) | 59.49 mph (95.75 km/h) |
| 60 mph (96.56 km/h) | 64.9 mph (104.45 km/h) |
| 65 mph (104.61 km/h) | 70.31 mph (113.16 km/h) |
| 70 mph (112.65 km/h) | 75.72 mph (121.86 km/h) |
| 75 mph (120.7 km/h) | 81.13 mph (130.57 km/h) |
| 80 mph (128.75 km/h) | 86.54 mph (139.27 km/h) |
| 85 mph (136.79 km/h) | 91.95 mph (147.97 km/h) |
| 90 mph (144.84 km/h) | 97.36 mph (156.68 km/h) |
| 95 mph (152.89 km/h) | 102.76 mph (165.38 km/h) |
| 100 mph (160.93 km/h) | 108.17 mph (174.09 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1791 | 2080 | 2240 | 2339 | 2446 | 2522 | 2606 | 2705 | 2842 | 2979 | 3132 | 3254 | 3475 | 3719 | 3909 | 4031 | 4100 | 4351 | 4702 | 5464 |
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