Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 40/12.5-20 | 275/65-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 40.03 (1016.8) | 34.07 (865.5) | -5.96 (-151.3) -14.9% |
| Width inches (mm) | 12.52 (318) | 10.83 (275) | -1.69 (-43) -13.5% |
| Circum. inches (mm) | 125.76 (3194.37) | 107.05 (2719.05) | -18.71 (-475.32) -14.9% |
| Sidewall Height inches (mm) | 10.02 (254.4) | 7.04 (178.75) | -2.98 (-75.65) -29.7% |
| Revolutions per mile (km) | 503.81 (313.05) | 591.88 (367.78) | 88.07 (54.72) 17.5% |
275/65-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.02 mph (27.4 km/h) |
| 25 mph (40.23 km/h) | 21.28 mph (34.25 km/h) |
| 30 mph (48.28 km/h) | 25.54 mph (41.1 km/h) |
| 35 mph (56.33 km/h) | 29.79 mph (47.95 km/h) |
| 40 mph (64.37 km/h) | 34.05 mph (54.8 km/h) |
| 45 mph (72.42 km/h) | 38.3 mph (61.64 km/h) |
| 50 mph (80.47 km/h) | 42.56 mph (68.49 km/h) |
| 55 mph (88.51 km/h) | 46.82 mph (75.34 km/h) |
| 60 mph (96.56 km/h) | 51.07 mph (82.19 km/h) |
| 65 mph (104.61 km/h) | 55.33 mph (89.04 km/h) |
| 70 mph (112.65 km/h) | 59.58 mph (95.89 km/h) |
| 75 mph (120.7 km/h) | 63.84 mph (102.74 km/h) |
| 80 mph (128.75 km/h) | 68.1 mph (109.59 km/h) |
| 85 mph (136.79 km/h) | 72.35 mph (116.44 km/h) |
| 90 mph (144.84 km/h) | 76.61 mph (123.29 km/h) |
| 95 mph (152.89 km/h) | 80.86 mph (130.14 km/h) |
| 100 mph (160.93 km/h) | 85.12 mph (136.99 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1506 | 1750 | 1884 | 1968 | 2057 | 2122 | 2192 | 2275 | 2391 | 2506 | 2634 | 2737 | 2923 | 3128 | 3288 | 3391 | 3448 | 3660 | 3955 | 4596 |
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