Sporting the new grey anodised finish, the Shimano Tiagra 10 speed rear derailleur (short cage) carries the chain across the sprockets with ease delivering high performance gear changes and operation all at a low price.
 
Features
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
30 tooth max, 25 tooth min low sprocket compatible