Shimano Tourney RD-TZ500 Rear Derailleur Mountain Bike Folding Bike 6-speed 7-speed 21-speed Transmission | Wish
Shimano-Road - In picture: Derailleur POSITRON ll. To develop safe, reliable and easy-to-operate shifting systems for any cyclist, Shimano announced POSITRON in 1974. This rear derailleur is equipped with an index system