Single speed bikes are bicycles designed with only one gear ratio, meaning they have a single gear for both pedaling and coasting. This simplicity makes them lightweight and easy to maintain, as there are fewer components compared to multi-gear bikes. They are ideal for flat terrains and urban commuting, where riders can enjoy a straightforward riding experience without the need for gear shifting. These bikes are often favored for their minimalist design and efficiency. Riders can easily navigate through city streets and enjoy a more direct connection to the bike's mechanics. Popular among casual cyclists, single speed bikes are also known for their affordability and stylish aesthetics, making them a trendy choice for many.