Shimano Ultegra RD-R8150F Di2 Rear Derailleur - 12-Speed Medium Cage Blair's Belts Breathable design keeps your feet

Breathable design keeps your feet fresh during all-day wear

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Shimano Ultegra RD-R8150F Di2 Rear Derailleur - 12-Speed Medium Cage Blair's Belts Breathable design keeps your feetExperience the precision of Shimano's Di2 technology with the Ultegra RD R8150 rear derailleur. Designed for cyclists who demand performance and reliability, this 12 speed derailleur offers versatility and advanced features for an enhanced riding experience. Compact design with integrated wireless unit charger switch for convenience Wider range capacity to accommodate various riding styles Compatible with max low sprocket of 34t for optimal gear