Show sprocket and chain assembly on giant sedona 21 speed bicycle?

(Image of a Giant Sedona 21-speed bicycle with the sprocket and chain assembly highlighted)

Components:

1. Front derailleur: This component, mounted on the bicycle's frame near the front wheel, is responsible for shifting the chain between the different front chainrings.

2. Rear derailleur: This component, mounted on the rear of the bicycle near the rear wheel, is responsible for shifting the chain between the different rear sprockets.

3. Chain: The chain is a metal loop that connects the front and rear sprockets, transferring power from the cyclist's pedaling to the rear wheel.

4. Front chainrings: These are the different-sized gears on the front of the bicycle that the chain can be shifted onto.

5. Rear sprockets: These are the different-sized gears on the rear of the bicycle that the chain can be shifted onto.

Operation:

1. When you change gear on your bike you are essentially altering the _gear ratio_ which ultimately changes how hard or easy it is to turn the pedals for any given speed.

2. When the chain is on a smaller front chainring and a larger rear sprocket, it is easier to pedal as the resistance is reduced.

3. When the chain is on a larger front chainring and a smaller rear sprocket, it is harder to pedal as the resistance is increased.

4. By combining the different front and rear chainring and sprocket combinations, you have a range of 21 different gear combinations to choose from, allowing you to find the ideal gear for the terrain you are riding on.

Shifting Instructions:

1. To shift gears on your Giant Sedona 21-speed bicycle, use the right and left shifters on your handlebars.

2. The left shifter controls the front derailleur and the right shifter controls the rear derailleur.

3. To shift to a higher gear (easier to pedal), use the left shifter to move the chain onto a smaller front chainring or the right shifter to move the chain onto a larger rear sprocket.

4. To shift to a lower gear (harder to pedal), use the left shifter to move the chain onto a larger front chainring or the right shifter to move the chain onto a smaller rear sprocket.

Maintenance:

To keep your sprocket and chain assembly in good working order, it is important to keep it clean and lubricated. You should also check the chain for any signs of wear and replace it if necessary.