Check the listing for details. microSHIFT Estes Thumb Tap Shifter - Left, 8-Speed, Optical Gear Indicator,. Color: Black, Condition: New. Listed at 21.72 USD. With a solid lever throw and crisp engagement, responsive shifting is just a click away. microSHIFT Estes right 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 rear derailleurs makes them an easy path to upgrade.Compatible with MTB 8-speed rear 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: Rear Der/Shifter Compatibility, Mountain, Drivetrain Speeds, 8, Shifter Style, Thumb, Color, Black,.