Shimano Tiagra Rd4500 9 Speed Rear Derailleur

This is a 9-speed Mega9 compatible rear derailleur that offers pro-level features and gives high performance at a low price.
It has a wide link design that increases rigidity and service life, advanced light action for low-friction shifting up or down the block and an Alloy body and outer link that leads to lower weight without compromising strength and durability.
It also has 11-tooth pulleys for reduced pulley wear and chain noise and two fluorine-coated link pin bushings for low-friction performance.