Serotta's now-legendary Integrated Technology frames carefully combine titanium and carbon fiber to yield the best qualities from each material. In the HSG IT, the two materials are optimized to maintain strength and reduce bending and twisting, resulting in an unbeatable drivetrain response. Stiff and lightweight, the HSG IT has all the responsiveness competitive cyclists seek without compromising comfort or durability. HSG is 100% handcrafted by the same craftspeople, in the same New York factory, as our Serotta Custom bikes.