Shimano Tiagra SL-4600 2-Speed Left Flat Bar Shifter ModelNumber=J2677 External cups press directly into

External cups press directly into the frames head tube

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Shimano Tiagra SL-4600 2-Speed Left Flat Bar Shifter ModelNumber=J2677 External cups press directly intoShimano Tiagra SL 4600 2 Speed Left Flat Bar Shifter. The Shimano SL 4600 flat bar shifter features Shimanos Super SLR technology Instant and 2 Way Release functionality and an optical gear display for clear visibility. The Super SLR design makes use of a friction reducing mechanism in the lever and cable that improves response and modulation Rapidfire Plus technology allows for quick shifting giving riders the ability to downshift three gears in one