Bicycle and tank: what they have in common

1. Step 1. Bicycle — has part — Bicycle drivetrain. The drivetrain transfers the force of the legs to the rear wheel — the main difference from a kick scooter.
2. Step 2. Bicycle drivetrain — has part — Sprocket. The front and rear sprockets set the gear ratio.
3. Step 3. Sprocket — is part of — Continuous track. The drive sprocket engages the track and pulls it round — just as a bicycle sprocket pulls the chain.
4. Step 4. Continuous track — is part of — Tank. Tracks let a tank cross trenches and rough ground.

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