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Now, I'm no expert, but I think a bike must have 2 tyres because thats what divides something like a bike with a tricycle. The long name for a bike is bicycle, bi-meaning 2. The same with tricycle, tri-means 3. Or a quad-bike, quad, meaning 4. However, scooters have 2 wheels as well, so I think what divides scooters and bikes is the fact bikes pedal and have chains and sprockets and with scooters you have to push.

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13y ago

What else can I help you with?