R539 Front Derailleur Options:R539 Front Derailleur 9-Speed Triple 52/42/30T, Braze-On, Shimano Compatible The Specialized Offset model is

The Specialized Offset model is most suitable for Specialized Turbo systems using the ISIS mount including: Levo

scale-tickling 685-gram frame—15% lighter than the Tarmac SL7 and lighter than anything else on the World Tour*

Not only is it the fastest in the tunnel

They also protect from dust and grease to keep riders and bikes cleaner

Compatible with RockShox Flight Attendant

R539 Front Derailleur Options:R539 Front Derailleur 9-Speed Triple 52/42/30T, Braze-On, Shimano Compatible The Specialized Offset model isFull metal construction provides stiffness and durability in this Shimano 9 speed road compatible front derailleur. Designed for use with 52 42 30t chainrings