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Over uneven ground, a cart with solid tyres does not give, when faced with a small object. When you pull it, the tyre will have to rise up and lift the cart over the object. This lifting requires more effort to raise the cart.

A rubber tyre will give a little and allow small objects to press into the tyre, without lifting it. Small bumps are averaged out and allow the cart to continue without being lifted, requiring extra force.

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12y ago
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Q: Why carts with rubber tires are easier to ply than those with iron tires?
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