![Gear Ratio: How It Works - Lego Technic](https://cdntube.b-cdn.net/thumbnails/4f7d711891639657f975ac2be88b4c1e9ca21b3b.jpg?v=19700101120000)
DrEnginesLab
DrEnginesLab
![Gear Ratio: How It Works - Lego Technic](https://cdntube.b-cdn.net/thumbnails/4f7d711891639657f975ac2be88b4c1e9ca21b3b.jpg?v=19700101120000)
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