Bicycle drivetrain and bellows: what they have in common

1. Step 1. Bicycle drivetrain — is part of — Bicycle. The drivetrain transfers the force of the legs to the rear wheel — the main difference from a kick scooter.
2. Step 2. Bicycle — has part — Saddle. The bicycle saddle took its name from the horse saddle.
3. Step 3. Saddle — is made of — Leather. A saddle is made of leather.
4. Step 4. Leather — is material for — Bellows. Bellows are a leather bag.

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