Road rear derailleurs

Road bike derailleurs from the bazaar represent a great opportunity to upgrade your road bike's equipment with components from higher-end Shimano (105, Ultegra, Dura-Ace), SRAM, or Campagnolo groupsets at a fraction of the original price. A correctly chosen and well-preserved road derailleur guarantees lightning-fast, quiet, and precise shifting on flats and steep climbs.
When buying a used road derailleur, it's worth checking:

• Mechanical versus electronic shifting: Make sure you are choosing a classic cable mechanism or an electronic derailleur (Shimano Di2, SRAM AXS / eTap), which requires a compatible battery and shifters.
• Cage length (SS vs. GS): A short cage is designed for smaller cassettes with cogs up to 28–30 teeth, while a medium cage can handle larger cogs (up to 34 teeth) for easier gears on climbs.
• Generation and compatibility with shifters: Verify the generation of your groupset and the pull ratio to ensure the new derailleur works flawlessly with your existing brake-shifter levers.
• Visual and mechanical condition: Check that the derailleur does not show signs of a heavy fall, that the cage is not bent, and that the guide pulleys are free of excessive play and wear.