Shimano Tiagra rear derailleur SS RD-4500

Offering pro-level features, the 9-speed compatible Tiagra rear derailleur gives high performance at a low price Tiagra rear derailleurs are Mega9 compatible Wide link design increases rigidity and service life Advanced light action for low-friction shifting up or down the block Alloy body's and outer link leads to lower weight without compromising strength and durability 11-tooth pulleys for reduced pulley wear and chain noise Two fluorine-coated link pin bushings for low-friction performance Compatible with 9-speed compact drive systems