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Defy Disc blends smooth and stable endurance geometry with the added confidence and control of disc brakes. Frame technologies include the OverDrive steerer tube for stiffness and sharp steering, the D-Fuse* seatpost for vibration damping, and a PowerCore oversized bottom bracket area for stiff, efficient power transfer.
* For Defy 1 and 2 models
Raw ALUXX SL tubesets are further refined through a complex series of processes that provides strength (extrusion), weight reduction (butting) and shape (forming).
Giant pioneered and perfected the use of radically shaped tubesets that provide all the strength and stability of gusseted tubes without added material and welds.
A massively oversized bottom-bracket/chainstay area features a fully integrated, 86-millimeter-wide bottom-bracket design. Asymmetric chainstays provide additional stiffness on the driveside and stability on the non-driveside.
Designed to provide precise front-end steering performance, the system’s oversized headset bearings (1 1/4” lower and1 1/8” upper) and tapered steerer tube work in conjunction to provide optimal steering stiffness.
A toptube that slopes downward from the headtube to the seattube reduces the size of the front and rear triangles. Smaller triangles create a lighter, stiffer bike.
The proprietary “D” shaped composite seatpost dampens vibration - resulting in a smooth, compliant ride.
Frame is engineered with disc brake tabs and features a disc brake-specific design for more confident braking in variable weather and terrain.