This 6/7 speed Shimano Tourney rear derailleur is a popular choice for cyclists in the uk. Providing a smooth and fast gear changing experience every time. It has a standard Direct Mount (bolt on) attachment. Features: Shimano TY300D 6 / 7-speed rear derailleur (direct attachment) SIS rear index shifting Smart cage Mega-range compatible Mega Pulley offers long service life and less noise Light shifting action