аморт, работающий на растяжение, с изменяемым ходом(130-80мм "на колесе"), двумя воздушными камерами и с двумя же независимыми контурами демпфирования. Короче говоря - два аморта в одномСообщение от Puffka
[FONT=Arial]How does it work?[/FONT]
[FONT=Arial]You've got a handlebar-mounted lever that you can use on-the-fly to flick backwards and forwards between the two. It moves a spool valve which changes the oil flow internally in the shock. The shock itself is kind of a reverse shock. It's a pull-shock, which is fairly different in the world of mountain bikes. In a traditional shock you have an oil bath and then you have an air spring and you push a piston through a fixed oil bath, so the oil bath doesn't move. The DYAD RT2 is really more of an oil pump. So the air piston for the negative chamber is actually the same as the primary piston. When the shock extends it pumps oil from the negative chamber, it pumps oil up into the positive chambers through the damping circuits, and it compresses the positive air spring. You have this kind of back-and-forth-shuffle of oil between the two chambers. [/FONT]
[FONT=Arial]The DYAD RT2 shock is a pull-shock. It utilizes two separate positive air chambers (one big and one small), a shared negative air chamber, and two independent damping circuits. DYAD’s unique in that, rather than moving a damping piston through an oil bath like a traditional shock, the DYAD instead acts like an oil pump, pumping the oil from one side of the shock to the other through the one of the two dedicated damping circuits. Each of the positive air chambers has its own floating piston that separates the oil volume from the air, while the pull-shock piston serves as both the primary oil piston and the negative air spring piston. Oil flow is controlled by something called a spool valve, which moves up or down when you flip the handlebar mounted lever, opening and closing two different oil paths. [/FONT]
[FONT=Arial]In the full travel setting (which Cannondale calls “FLOW”), the two positive air chambers are linked, creating a huge volume air spring which is balanced by the independently adjustable negative air spring. The combination of the large volume positive air spring, the adjustable negative air spring, and the high operating shock pressures creates a linear spring rate that is really similar to that of a coil spring. [/FONT]
[FONT=Arial]In the short travel “Elevate” setting, one of the positive chambers is completely shut off, reducing the air volume and ramping up the spring rate. All of the oil is directed through the other damping circuit, changing the damping characteristics at the same time.[/FONT]
[FONT=Arial]Another interesting thing is the effect this has on geometry. [/FONT]
[FONT=Arial]Since the air volume is reduced in the short travel mode, the bike sags less, making the effective seat angle and steering angle steeper, better for climbing and slower techy stuff. Flip the switch and the BB drops, the whole bike gets lower and slacker for high speed stability.[/FONT]
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