Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 165/60-20 | 255/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.8 (706) | 28.03 (712) | 0.24 (6) 0.8% |
| Width inches (mm) | 6.5 (165) | 10.04 (255) | 3.54 (90) 54.5% |
| Circum. inches (mm) | 87.32 (2217.96) | 88.06 (2236.81) | 0.74 (18.85) 0.8% |
| Sidewall Height inches (mm) | 3.9 (99) | 4.02 (102) | 0.12 (3) 3% |
| Revolutions per mile (km) | 725.6 (450.86) | 719.48 (447.06) | -6.11 (-3.8) -0.8% |
255/40-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.17 mph (32.46 km/h) |
| 25 mph (40.23 km/h) | 25.21 mph (40.58 km/h) |
| 30 mph (48.28 km/h) | 30.25 mph (48.69 km/h) |
| 35 mph (56.33 km/h) | 35.3 mph (56.81 km/h) |
| 40 mph (64.37 km/h) | 40.34 mph (64.92 km/h) |
| 45 mph (72.42 km/h) | 45.38 mph (73.04 km/h) |
| 50 mph (80.47 km/h) | 50.42 mph (81.15 km/h) |
| 55 mph (88.51 km/h) | 55.47 mph (89.27 km/h) |
| 60 mph (96.56 km/h) | 60.51 mph (97.38 km/h) |
| 65 mph (104.61 km/h) | 65.55 mph (105.5 km/h) |
| 70 mph (112.65 km/h) | 70.59 mph (113.61 km/h) |
| 75 mph (120.7 km/h) | 75.64 mph (121.73 km/h) |
| 80 mph (128.75 km/h) | 80.68 mph (129.84 km/h) |
| 85 mph (136.79 km/h) | 85.72 mph (137.96 km/h) |
| 90 mph (144.84 km/h) | 90.76 mph (146.07 km/h) |
| 95 mph (152.89 km/h) | 95.81 mph (154.19 km/h) |
| 100 mph (160.93 km/h) | 100.85 mph (162.3 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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