HOW THINGS WORK

· How do the gears of a rac­ing bike work?

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Gears al­low a rac­ing cy­clist to keep up a com­fort­able pedalling rhythm up­hill and down­hill. When the cy­clist changes gears, the chain shifts from one gear wheel to an­other with a dif­fer­ent num­ber of teeth. If the chain links the front gear wheel with the most teeth and the small­est back gear wheel, the bike is in the high­est gear.

PED­ALS POWER GEAR WHEELS 1

As a cy­clist ped­als, the crank ro­tates. It is fas­tened to two or three gear wheels lo­cated in lay­ers. The out­er­most gear wheel has the most teeth.

THE CHAIN TRANS­FERS EN­ERGY 2

The gear se­lec­tor makes a front de­railleur force the chain from one gear wheel to an­other. The force of the pedalling is trans­ferred via the chain to rear wheel gear wheels.

GEAR DE­TER­MINES REV­O­LU­TIONS 3

The rear de­railleur ad­justs the chain's length and shifts it be­tween the gear wheels of the rear wheel. The greater the teeth num­ber dif­fer­ence of the front and rear wheel gear wheels, the higher the ca­dence.

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