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Fixed-gear bikes are a type of bicycle that has a single gear ratio. This means that the pedals are always turning at the same speed as the wheels. This can make for a more challenging ride, but it also allows for more control and efficiency.

Fixed-gear bikes are often used for track racing, but they can also be used for commuting and recreational riding. They are becoming increasingly popular in urban areas, as they are a great way to get around without having to worry about traffic or parking.

Here are some of the advantages of fixed-gear bikes:

• Simple: Fixed-gear bikes are relatively simple machines, which means they are easy to maintain and repair.
• Efficient: Fixed-gear bikes are very efficient, as there is no need for a derailleur or other gears.
• Control: Fixed-gear bikes give the rider a lot of control, as they can slow down or stop by simply resisting the pedals.
• Fun: Fixed-gear bikes are a lot of fun to ride, and they can be a great way to get some exercise.

Here are some of the disadvantages of fixed-gear bikes:

• Challenging: Fixed-gear bikes can be challenging to ride, especially at first.
• Dangerous: Fixed-gear bikes can be dangerous if the rider is not careful. For example, if the rider stops pedaling, the bike will continue to move forward, which can lead to a crash.
• Not for everyone: Fixed-gear bikes are not for everyone. Some people prefer the convenience of a derailleur bike, or they may not be comfortable with the challenge of riding a fixed-gear bike.

Overall, fixed-gear bikes are a great option for people who are looking for a simple, efficient, and fun way to get around. However, it is important to be aware of the challenges and dangers before making the decision to buy a fixed-gear bike.