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The Shimano 105 R7100 Mechanical 12-Speed Groupset offers a comprehensive upgrade for road cyclists, combining premium components with advanced shifting technology and reliable braking performance. Here's a breakdown of its features and what's included:Groupset Components:Chainset: Shimano 105 R7100 12-speed chainset (size selectable)Cassette: Shimano 105 CS-HG710 12-speed 11-36T cassetteShift/Brake Levers: Shimano 105 R7120 mechanical STI hydraulic brake/shift levers (right and left)Brake Calipers: Shimano 105 BR-R7170 hydraulic disc brake calipers (front and rear)Rear Derailleur: Shimano 105 RD-R7100 12-speed rear derailleur (black)Front Derailleur: Shimano 105 FD-R7100 12-speed toggle link front derailleur (double braze-on, black)Chain: Shimano/SLX CN-M7100 HG+ 12-speed 126L chain (silver)Features:Smooth Shifting: The 12-speed rear derailleur features Shimano's SHADOW RD design for smooth and stable shifting, along with direct mount compatibility and a wider gear range capacity.Ergonomic Design: The R7120 dual-control levers have a revised lever position and bracket shape, accommodating a wide range of hand sizes and offering all-condition confidence with hydraulic disc brakes.Wide Gear Range: The 11-36T 12-speed cassette provides a wide gear range of 327%, suitable for sprinting on flats and tackling steep climbs. Gear steps are optimized for pedaling efficiency, offering natural and comfortable connection.Race-Ready Braking: The R7170 hydraulic disc brake calipers feature a new piston design, offering race-ready braking performance for riders of all levels.Not Included:Bottom Bracket: A suitable bottom bracket for your frame is required.Brake Rotors: Brake rotors are not included and need to be purchased separately.Overall, the Shimano 105 R7100 Mechanical 12-Speed Groupset delivers reliable shifting, precise braking, and ergonomic design, making it an excellent choice for road cyclists looking to upgrade their bike's performance.