The design of KR-390 is engineered to increase strength and stiffness where needed,
we provide you with a frame that won't waste you power:Adopting tapered head tube which
increases frame stiffness and strength with more tube contact area and increased diameter.
Aero shaped down tube which not only makes the frame aerodynamic, but also adds strength
to the frame Using same seat tube as KR-400 which is built with oversized dimensions at the BB
shell to increase the frame strength and BB stiffness.
The design of the chainstsy is also specifically engineered to complement the stiffness
of the BB area.And the KR-390 has dramatically thin top tube for lighter weight.