microSHIFT BS-A12 Bar End Road Shifter Set - 2x 12-Speed, Shimano 12-Speed Road Compatible, BlackmicroSHIFT bar end shifters are the simplest, most reliable way to shift on a drop bar bike. With adjustable shifting tension and few moving parts, these shifters deliver unprecedented reliability, adjustability, and flexibility in case of mechanical issues. Perfect for touring every corner of planet Earth or riding around with your friends. Or both! Expander plug compatible with handlebars with internal diameter of 19 21mm Product Specifics Double or