Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/40-21 | 275/40-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.03 (737.4) | 29.66 (753.4) | 0.63 (16) 2.2% |
| Width inches (mm) | 10.04 (255) | 10.83 (275) | 0.79 (20) 7.8% |
| Circum. inches (mm) | 91.21 (2316.61) | 93.18 (2366.88) | 1.98 (50.27) 2.2% |
| Sidewall Height inches (mm) | 4.02 (102) | 4.33 (110) | 0.31 (8) 7.8% |
| Revolutions per mile (km) | 694.7 (431.66) | 679.94 (422.5) | -14.75 (-9.17) -2.1% |
275/40-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.43 mph (32.89 km/h) |
| 25 mph (40.23 km/h) | 25.54 mph (41.11 km/h) |
| 30 mph (48.28 km/h) | 30.65 mph (49.33 km/h) |
| 35 mph (56.33 km/h) | 35.76 mph (57.55 km/h) |
| 40 mph (64.37 km/h) | 40.87 mph (65.77 km/h) |
| 45 mph (72.42 km/h) | 45.98 mph (73.99 km/h) |
| 50 mph (80.47 km/h) | 51.08 mph (82.21 km/h) |
| 55 mph (88.51 km/h) | 56.19 mph (90.43 km/h) |
| 60 mph (96.56 km/h) | 61.3 mph (98.66 km/h) |
| 65 mph (104.61 km/h) | 66.41 mph (106.88 km/h) |
| 70 mph (112.65 km/h) | 71.52 mph (115.1 km/h) |
| 75 mph (120.7 km/h) | 76.63 mph (123.32 km/h) |
| 80 mph (128.75 km/h) | 81.74 mph (131.54 km/h) |
| 85 mph (136.79 km/h) | 86.84 mph (139.76 km/h) |
| 90 mph (144.84 km/h) | 91.95 mph (147.98 km/h) |
| 95 mph (152.89 km/h) | 97.06 mph (156.21 km/h) |
| 100 mph (160.93 km/h) | 102.17 mph (164.43 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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