Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/30-21 | 275/40-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.5 (698.4) | 29.66 (753.4) | 2.17 (55) 7.9% |
| Width inches (mm) | 10.83 (275) | 10.83 (275) | 0 (0) 0% |
| Circum. inches (mm) | 86.38 (2194.09) | 93.18 (2366.88) | 6.8 (172.79) 7.9% |
| 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) | 679.94 (422.5) | -53.55 (-33.27) -7.3% |
275/40-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.58 mph (34.72 km/h) |
| 25 mph (40.23 km/h) | 26.97 mph (43.4 km/h) |
| 30 mph (48.28 km/h) | 32.36 mph (52.08 km/h) |
| 35 mph (56.33 km/h) | 37.76 mph (60.76 km/h) |
| 40 mph (64.37 km/h) | 43.15 mph (69.44 km/h) |
| 45 mph (72.42 km/h) | 48.54 mph (78.12 km/h) |
| 50 mph (80.47 km/h) | 53.94 mph (86.8 km/h) |
| 55 mph (88.51 km/h) | 59.33 mph (95.48 km/h) |
| 60 mph (96.56 km/h) | 64.73 mph (104.17 km/h) |
| 65 mph (104.61 km/h) | 70.12 mph (112.85 km/h) |
| 70 mph (112.65 km/h) | 75.51 mph (121.53 km/h) |
| 75 mph (120.7 km/h) | 80.91 mph (130.21 km/h) |
| 80 mph (128.75 km/h) | 86.3 mph (138.89 km/h) |
| 85 mph (136.79 km/h) | 91.69 mph (147.57 km/h) |
| 90 mph (144.84 km/h) | 97.09 mph (156.25 km/h) |
| 95 mph (152.89 km/h) | 102.48 mph (164.93 km/h) |
| 100 mph (160.93 km/h) | 107.88 mph (173.61 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1730 | 2010 | 2165 | 2260 | 2364 | 2437 | 2518 | 2614 | 2746 | 2879 | 3026 | 3144 | 3358 | 3593 | 3777 | 3895 | 3961 | 4204 | 4543 | 5279 |
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