Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/30-21 | 275/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.5 (698.4) | 28.66 (728) | 1.17 (29.6) 4.2% |
| Width inches (mm) | 10.83 (275) | 10.83 (275) | 0 (0) 0% |
| Circum. inches (mm) | 86.38 (2194.09) | 90.04 (2287.08) | 3.66 (92.99) 4.2% |
| Sidewall Height inches (mm) | 3.25 (82.5) | 4.33 (110) | 1.08 (27.5) 33.3% |
| Revolutions per mile (km) | 733.49 (455.77) | 703.67 (437.24) | -29.82 (-18.53) -4.1% |
275/40-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.85 mph (33.55 km/h) |
| 25 mph (40.23 km/h) | 26.06 mph (41.94 km/h) |
| 30 mph (48.28 km/h) | 31.27 mph (50.33 km/h) |
| 35 mph (56.33 km/h) | 36.48 mph (58.71 km/h) |
| 40 mph (64.37 km/h) | 41.7 mph (67.1 km/h) |
| 45 mph (72.42 km/h) | 46.91 mph (75.49 km/h) |
| 50 mph (80.47 km/h) | 52.12 mph (83.88 km/h) |
| 55 mph (88.51 km/h) | 57.33 mph (92.27 km/h) |
| 60 mph (96.56 km/h) | 62.54 mph (100.65 km/h) |
| 65 mph (104.61 km/h) | 67.75 mph (109.04 km/h) |
| 70 mph (112.65 km/h) | 72.97 mph (117.43 km/h) |
| 75 mph (120.7 km/h) | 78.18 mph (125.82 km/h) |
| 80 mph (128.75 km/h) | 83.39 mph (134.2 km/h) |
| 85 mph (136.79 km/h) | 88.6 mph (142.59 km/h) |
| 90 mph (144.84 km/h) | 93.81 mph (150.98 km/h) |
| 95 mph (152.89 km/h) | 99.03 mph (159.37 km/h) |
| 100 mph (160.93 km/h) | 104.24 mph (167.76 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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