The Shimano Tiagra RD-4601 10 Speed Rear Derailleur offers professional-level features & high performance aspects at an affordable price. The Shimano rear derailleur has a wide link design which increases the rigidity & the service life of the derailleur & it has an advanced, light action for low-friction shifting up or down the block. Alloy bodys & outer link leads to lower weight without compromising strength & durability 11-tooth pulleys for reduced pulley wear & chain noise Two fluorine-coated link pin bushings for low-friction performance Shimano Tiagra RD-4601 10 Speed Rear Derailleur Specification