The versatile Shimano FD-TY600/TY601/TY606 series of top-swing front derailleurs shift with a smooth light action and fits many bike styles. Compatible with 6/7/8-speed Dual SIS technology delivers reliable shifting performance Versatile performance and wide compatibility with a single specification that covers a wide range of usage 34.9mm and 31.9mm (with adapter) dual-pull/multi-clamp band