Shimano Dura-Ace ST-R9120 Shifter Only (Disc Brake) Size:Left Shifter Only Extensive comparative tests have demonstrated

Extensive comparative tests have demonstrated that the 9-tooth is as efficient as any 10 or 11-tooth sprocket on any system

ANT+ PWR profile (CT + PO)

255g (53/39)

Quick and intuitive rear shifting operation

X-SYNC pulleys for increased durability and efficiency

Shimano Dura-Ace ST-R9120 Shifter Only (Disc Brake) Size:Left Shifter Only Extensive comparative tests have demonstratedCombining SHIMANO's well praised hydraulic disc brake technology with light action mechanical shifting, the DURA ACE R9120 levers have a shorter lever stroke, expanded reach adjust, and lighter front shift action. Specifications Mechanical Shifting with Hydraulic Brake Hoses Quick and intuitive rear shifting operation Shorter lever stroke Redesigned internal shifting unit Lighter front shifting operation Redesigned front system with new front