Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 295/30-21 | 275/40-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.97 (710.4) | 29.66 (753.4) | 1.69 (43) 6.1% |
| Width inches (mm) | 11.61 (295) | 10.83 (275) | -0.79 (-20) -6.8% |
| Circum. inches (mm) | 87.87 (2231.79) | 93.18 (2366.88) | 5.32 (135.09) 6.1% |
| Sidewall Height inches (mm) | 3.48 (88.5) | 4.33 (110) | 0.85 (21.5) 24.3% |
| Revolutions per mile (km) | 721.1 (448.07) | 679.94 (422.5) | -41.16 (-25.57) -5.7% |
275/40-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.21 mph (34.14 km/h) |
| 25 mph (40.23 km/h) | 26.51 mph (42.67 km/h) |
| 30 mph (48.28 km/h) | 31.82 mph (51.2 km/h) |
| 35 mph (56.33 km/h) | 37.12 mph (59.74 km/h) |
| 40 mph (64.37 km/h) | 42.42 mph (68.27 km/h) |
| 45 mph (72.42 km/h) | 47.72 mph (76.8 km/h) |
| 50 mph (80.47 km/h) | 53.03 mph (85.34 km/h) |
| 55 mph (88.51 km/h) | 58.33 mph (93.87 km/h) |
| 60 mph (96.56 km/h) | 63.63 mph (102.41 km/h) |
| 65 mph (104.61 km/h) | 68.93 mph (110.94 km/h) |
| 70 mph (112.65 km/h) | 74.24 mph (119.47 km/h) |
| 75 mph (120.7 km/h) | 79.54 mph (128.01 km/h) |
| 80 mph (128.75 km/h) | 84.84 mph (136.54 km/h) |
| 85 mph (136.79 km/h) | 90.14 mph (145.07 km/h) |
| 90 mph (144.84 km/h) | 95.45 mph (153.61 km/h) |
| 95 mph (152.89 km/h) | 100.75 mph (162.14 km/h) |
| 100 mph (160.93 km/h) | 106.05 mph (170.68 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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