Switch between road riding and aerodynamic timing positions when riding. Adapt to the conditions you encounter while driving. Climb the mountain comfortably in the position of the road bike, and stretch the speed flatly in the position of the aerodynamic timing. Flexible and individually adjustable: Thanks to replaceable springs, easy-to-adjust pre-tightening force and fast-adjusting pre-tightening force, you can immediately adapt to your driving experience and the driving terrain. Suitable for bicycles, electric bicycles, high-speed electric bicycles (S-Pedelecs) With a suspended seatpost, riding a bike is an experience in itself. Improved traction and control while driving open the door to a whole new driving experience. Adjustable spring seatpost: Effectively isolate vibration, shock and bumps, provide comfortable and efficient driving pleasure, and reduce fatigue.