Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/40-20 | 255/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.09 (688) | 28.03 (712) | 0.94 (24) 3.5% |
| Width inches (mm) | 8.86 (225) | 10.04 (255) | 1.18 (30) 13.3% |
| Circum. inches (mm) | 85.1 (2161.42) | 88.06 (2236.81) | 2.97 (75.4) 3.5% |
| Sidewall Height inches (mm) | 3.54 (90) | 4.02 (102) | 0.47 (12) 13.3% |
| Revolutions per mile (km) | 744.58 (462.66) | 719.48 (447.06) | -25.1 (-15.6) -3.4% |
255/40-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.7 mph (33.31 km/h) |
| 25 mph (40.23 km/h) | 25.87 mph (41.64 km/h) |
| 30 mph (48.28 km/h) | 31.05 mph (49.96 km/h) |
| 35 mph (56.33 km/h) | 36.22 mph (58.29 km/h) |
| 40 mph (64.37 km/h) | 41.4 mph (66.62 km/h) |
| 45 mph (72.42 km/h) | 46.57 mph (74.95 km/h) |
| 50 mph (80.47 km/h) | 51.74 mph (83.27 km/h) |
| 55 mph (88.51 km/h) | 56.92 mph (91.6 km/h) |
| 60 mph (96.56 km/h) | 62.09 mph (99.93 km/h) |
| 65 mph (104.61 km/h) | 67.27 mph (108.26 km/h) |
| 70 mph (112.65 km/h) | 72.44 mph (116.58 km/h) |
| 75 mph (120.7 km/h) | 77.62 mph (124.91 km/h) |
| 80 mph (128.75 km/h) | 82.79 mph (133.24 km/h) |
| 85 mph (136.79 km/h) | 87.97 mph (141.57 km/h) |
| 90 mph (144.84 km/h) | 93.14 mph (149.89 km/h) |
| 95 mph (152.89 km/h) | 98.31 mph (158.22 km/h) |
| 100 mph (160.93 km/h) | 103.49 mph (166.55 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1831 | 2127 | 2291 | 2392 | 2501 | 2579 | 2665 | 2766 | 2906 | 3046 | 3202 | 3327 | 3553 | 3802 | 3997 | 4122 | 4192 | 4449 | 4807 | 5586 |
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