Road bikes and MTB hardtails are deliberately rigid in the rear. This way, they do not only reach low weights but also turn each rider-provided watt into propulsion. Yet a rigid rear end transmits bumps back to the rider as well – this affects the athlete’s performance potential. But not in the case of our “Flex Stay” seat and chain stays: Their special design works like a flat spring to absorb surface bumps and reduce vibrations effectively.