Hello, my name is Kimi, and I'm an expert in the field of cycling. I'm here to provide you with a detailed explanation of the differences between a freewheel and a freehub.

Step 1: English Explanation

A freewheel and a freehub are two components found on bicycles, particularly those with multiple gears. They serve similar functions but are distinct in their design and operation.

Freewheel:
A freewheel is a mechanism that allows a cyclist to coast without pedaling, meaning the rider can stop pedaling and the bike will continue to move forward. This is achieved by having a set of sprockets that are free to rotate in one direction but are locked in the other direction by a ratchet mechanism. The freewheel is traditionally found on the rear wheel of a bike and is an integral part of the wheel itself. It is installed on the right side of the wheel, where the chain engages with the sprockets. When the rider pedals, the force is transferred from the pedals to the chain, which then engages with the freewheel, propelling the bike forward. When the rider stops pedaling, the freewheel allows the sprockets to rotate freely, enabling coasting.

Freehub:
A freehub, on the other hand, is a more modern component that also allows for coasting but is part of the rear hub assembly rather than the wheel itself. The freehub is essentially a cassette of gears that can rotate freely when not under pedaling force. It is built into the rear hub, which means that the cassette and the hub are a single unit. The freehub mechanism uses a set of pawls and springs that engage with the cassette to lock it in place when pedaling and allow it to freewheel when coasting. The cassette itself is a set of gears that can be easily replaced or adjusted, offering a range of gear ratios to suit different riding conditions.

Differences:

1. Integration: The freewheel is integrated into the wheel, while the freehub is part of the rear hub assembly.

2. Design: Freewheels traditionally have a ratchet mechanism, whereas freehubs use a pawl and spring system.

3. Maintenance: Freewheels can be more difficult to service and replace, as they are part of the wheel. Freehubs allow for easier maintenance and replacement of the cassette.

4. Compatibility: Freewheels are compatible with older bikes and require specific freewheel-compatible shifters and derailleurs. Freehubs are standard on most modern bikes and work with modern indexing shifters and derailleurs.

5. Cassette: With a freewheel, the cassette is not a separate component and cannot be easily replaced. With a freehub, the cassette is a separate unit that can be easily swapped out for different gear ratios.

Step 2: Separator

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On most modern bikes with multiple gears, the freewheel is built into the rear hub and the whole assembly is called a freehub. The cassette is just a set of gears bolted together, without any moving parts, that slides onto the hub and is held in place with a lockring.Apr 30, 2014read more >>