A freewheel is a ratchet mechanism mounted on the rear hub which allows the chain to drive the wheel forwards via a cog but when the wheels move faster than the chain the cog is not driven round by the wheel. A freewheel allows a rider to rest their legs while the bike is moving forward.
Step 1
Engage the bike freewheel
Lift the rear wheel of the ground and kick the pedals to start it turning.
Step 2
Watch
The rear wheel should spin while the cranks stop turning. If the rear wheel pushes the cranks around there may be a problem with the bike freewheel.
Step 3
Listen
The bike freewheel should make a regular metallic clicking sound when the wheel runs and the pedals are still. Changes in the sound of a bike freewheel may be a sign that it’s wearing out.