With its longer wheelbase & slightly taller headtube for endurance positioning, Defy Composite gives you a lightweight, smooth riding feel that makes the road disappear. Crafted from Giant’s Composite frame material, it features innovative technologies including the Power Core bottom bracket & Over Drive headtube for stiff pedalling efficiency & razor-sharp handling. The frame is also Ride Sense-ready, for use with Giant’s wireless ANT+ data device.