noun
- a mechanism on a bicycle that moves the chain from one gear to another by guiding it onto different sprockets
Usage: cycling
Examples
- The rear derailleur shifted smoothly between gears as she climbed the hill.
- He adjusted the derailleur cable to fix the skipping chain.
- The bike mechanic replaced the damaged derailleur after the crash.
- Modern derailleurs allow cyclists to change gears quickly and efficiently.
- The front derailleur moves the chain between the large chainrings.
- She learned to tune her derailleur for optimal shifting performance.