Check the listing for details. microSHIFT Estes Thumb Tap Shifter - Left, Triple, Optical Gear Indicator, Black. Color: Black, Condition: New. Listed at 14.95 USD. With a solid lever throw and crisp engagement, responsive shifting is just a click away. microSHIFT Estes left thumb tap shifters are designed with a precision and durability not usually seen in entry level shifters. And the fact that they’re compatible with standard front derailleurs makes them an easy path to upgrade.Compatible with MTB triple front derailleurs. Gear indicator window displays current gear choice for easy identification. Upgraded mechanism durability provides three times longer service life. 11% lighter shifting force than previous generation. Updated composite construction for stiffer, more responsive thumb levers. Item Specifications: Double or Triple, Triple, Drivetrain Speeds, 7, Drivetrain Speeds, 8, Drivetrain Speeds, 9, Front Der/Shifter.