Shimano 105 5800 Ss 11-speed Rear Derailleur Pulley Set M7000/m675/m670/m663/m640/m615/m610/m593 Tension And Guide Pulley Set - Bicycle Derailleur - AliExpress
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Amazon.com : Shimano 105 5800-GS 11-Speed Rear Derailleur Pulley Set - For Medium Cage : Sports & Outdoors