wheel-hub-dat
- 14 x 2.125
16 x 2.125
12~20 inch
14-inch wheels == kids bike
front wheel
rear wheel
other sizes
- 24-inch == wheelchair
static wheel hub
in almost all modern bicycles, the axle itself does not rotate.
Bicycle Rear Wheel Rotation: What Moves?
| Component | Status | Movement Description |
|---|---|---|
| Axle (The Axis) | Stationary | Bolted or clamped to the bike frame; it never spins. |
| Sprockets (Gears) | Rotating | Spin when you pedal; they stay still when you "coast." |
| Hub Shell & Wheel | Rotating | Always spin while the bike is in motion. |
| Bearings | Active | The bridge that allows the wheel to spin around the static axle. |
How it works:
- Your frame holds the axle perfectly still.
- The bearings sit on that axle.
- The hub (the middle of the wheel) sits on the bearings.
- When you pedal, the sprockets push the hub, and the whole wheel spins around that fixed center axis.