Tricycle and fitness tracker: what they have in common

1. Step 1. Tricycle — has part — Roller chain. A chain drive.
2. Step 2. Roller chain — is part of — Electric bicycle. The chain drive from the pedals remains.
3. Step 3. Electric bicycle — has part — Hub motor. A hub motor or a mid-drive motor.
4. Step 4. Hub motor — is part of — Electric unicycle. A hub motor.
5. Step 5. Electric unicycle — has part — Accelerometer. Tilt sensors.
6. Step 6. Accelerometer — is part of — Fitness tracker. A pedometer.

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