Dura-Ace Di2
The Dura-Ace Di2 offers an electronic front and rear derailleur that runs on rechargeable batteries. This derailleur technology benefits time trialists and track and road cyclists with precise shifting that allows riders to better focus on the road. Known officially as the FD Di2 and the RD-7970, these derailleurs offer aluminum bracket bodies, carbon plates and an engineered composite plate body. These derailleurs are meant to be used with a 10-speed cassette.
XTR RD-M972-SGS
Whether the trail or gravity defying jumps are in order, mountain bikers will best be served by XTR RD-M972-SGS. This rear derailleur features direct cable routing, carbon plates and sealed bearings in both guide and tension pulleys and no chainstay contact. Specifications include a 45T total capacity, fluorine-coated link pin bushings, bracket pivot seal with double O-rings and an average weight of 182g.
Dura-Ace RD-7900-SS
The Dura-Ace RD-7900-SS offers those pedaling road bikes one of the best traditional rear derailleurs available. Features include a pulley plate made of carbon, 28T cog capacity and cold-forged aluminum links. Specifications include 10-speed cassette compatibility, plate pivot seal with a single O-ring, a plastic plate body, a minimum and maximum sprocket of 11T to 28T and an overall average weight of 166g.
Article Written By Mike Biscoe
Mike Biscoe has been writing since 2009. Focusing on travel, sports and entertainment topics, he has credits in various online publications including LIVESTRONG.COM and Trails. He often writes articles covering uncommon travel destinations from firsthand experience. Biscoe holds a Certificate of
Completion in acting from the Pacific Conservatory of the Performing Arts.
