Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/65-17 | 255/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28 (711.3) | 28.03 (712) | 0.03 (0.7) 0.1% |
| Width inches (mm) | 8.46 (215) | 10.04 (255) | 1.57 (40) 18.6% |
| Circum. inches (mm) | 87.98 (2234.61) | 88.06 (2236.81) | 0.09 (2.2) 0.1% |
| Sidewall Height inches (mm) | 5.5 (139.75) | 4.02 (102) | -1.49 (-37.75) -27% |
| Revolutions per mile (km) | 720.19 (447.5) | 719.48 (447.06) | -0.71 (-0.44) -0.1% |
255/40-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.02 mph (32.22 km/h) |
| 25 mph (40.23 km/h) | 25.02 mph (40.27 km/h) |
| 30 mph (48.28 km/h) | 30.03 mph (48.33 km/h) |
| 35 mph (56.33 km/h) | 35.03 mph (56.38 km/h) |
| 40 mph (64.37 km/h) | 40.04 mph (64.44 km/h) |
| 45 mph (72.42 km/h) | 45.04 mph (72.49 km/h) |
| 50 mph (80.47 km/h) | 50.05 mph (80.55 km/h) |
| 55 mph (88.51 km/h) | 55.05 mph (88.6 km/h) |
| 60 mph (96.56 km/h) | 60.06 mph (96.66 km/h) |
| 65 mph (104.61 km/h) | 65.06 mph (104.71 km/h) |
| 70 mph (112.65 km/h) | 70.07 mph (112.77 km/h) |
| 75 mph (120.7 km/h) | 75.07 mph (120.82 km/h) |
| 80 mph (128.75 km/h) | 80.08 mph (128.87 km/h) |
| 85 mph (136.79 km/h) | 85.08 mph (136.93 km/h) |
| 90 mph (144.84 km/h) | 90.09 mph (144.98 km/h) |
| 95 mph (152.89 km/h) | 95.09 mph (153.04 km/h) |
| 100 mph (160.93 km/h) | 100.1 mph (161.09 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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