The biggest monster truck tyres are taller than a whole car.
Each giant wheel can be about 3 metres tall. They help the truck roll right over other cars!
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Wheels roll round and round so things move without dragging.
Skateboards have four little wheels underneath a wooden board.
A wheelbarrow has just one wheel to help carry heavy loads.
Roller skates let you glide along on wheels on your feet.
Shopping carts have wheels so they are easy to push around the shop.