Derailleurs

关于

Bike derailleurs are essential drivetrain components that control gear shifting on multi-speed bikes. They move the chain between sprockets or chainrings. This adjusts pedalling resistance and maintain efficient pedalling cadence. There are two main types of derailleurs: Front derailleurs move the chain across the chainrings. Rear derailleurs shift the chain across the cassette. Modern derailleurs are available in both mechanical and electronic systems.