Giant Defy Advanced 1 Carbon Road Bike Shimano Tiagra 52cm Small 2017 Posted October 31, 2023 Giant Defy Advanced 1 Carbon Road Bike Shimano Tiagra 52cm Small 2017Brakes: Shimano hydraulic Brakes. Front Derailleur: Shimano Ultegra 6800. Rear Derailleur: Shimano Ultegra 6800. Crankset: Shimano Ultegra 6800 (50:34 ratio).