Shimano 5501 105 Rear Derailleur GS - £21.99

Compatible with 9 or 8-Speed cassettes Rear derailleurs are designed to the same precise 9-speed specifications as Dura-Ace, and can also be used with 8-speed cassettes. Long-Life Pulleys The use of larger 11-tooth pulleys results in alternating chain link contact to reduce abrasion and pulley wear. Ultegra derailleur uses a low-friction ceramic bushing in the guide pulley, and ball bearing in the tension pulley to increase pulley durability. Advanced Light Action / Light and precise shifting action regardless of derailleur position. Zytel* Resin Pulleys / Tough resilient Zytel* resin pulleys resist wear and reduce chain noise. (Zytel is a trademark of Dupont Corporation).