Rocket draws a wheel. He makes a circle and adds a dot in the middle. "Done!"
Raven holds up a picture of a real wheel. "What do you notice between the middle and the edge?"
Rocket squints. "Lots of thin lines!"
Nova hovers beside the picture. "Start at the center and travel out," she says. "Name each part you pass."
The hub is the center of the wheel. The axle goes through it.
Spokes are thin rods. They connect the hub to the rim.
Spokes carry the weight of the rider and the bike.
The rim is the outer edge of the wheel. It holds the tire.
The tire wraps around the rim. It grips the ground as the wheel rolls.
| Part | Where it is | Its job |
|---|---|---|
| hub | the center | holds the wheel on the axle |
| spokes | between hub and rim | connect hub to rim and carry weight |
| rim | the outer edge of the wheel | holds the tire |
| tire | around the rim | grips the ground |
| Statement | True or false? |
|---|---|
| The hub is at the center of the wheel. | ? |
| Spokes connect the hub to the rim. | ? |
| The rim is in the very middle of the wheel. | ? |
| Spokes help carry the weight of the rider. | ? |
Wonderful wheel work! Tomorrow we follow the push from your feet all the way to the back wheel.