Bicycle frame and fitness tracker: what they have in common

1. Step 1. Bicycle frame — is part of — Bicycle. The frame ties all the units together and carries the rider.
2. Step 2. Bicycle — evolved into — Electric bicycle. A bicycle with an electric drive.
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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