With a hint of reluctance, I agreed and this is how the TAC-r system was explained to me. According to MX-Tech, the stock fork is too progressive and they wanted to make the action more linear. There is a new high pressure region (250 psi) positioned above the main pressure region (167 psi) with a separation piston that starts to compress as the main pressure region increases, slowing the rate at which the volume change accelerates. I’m not a suspension guru so I’m not entirely sure how this works. There is also still a low pressure region (18 psi) and a balance chamber (152 psi). To fill the high, mid, and low pressure regions, MX-Tech had to change the fork cap to have three valves, but they are smaller than regular Schrader valves and female rather than male, so they also require the use of what MX-Tech calls their Bone Tool that allows you to use a normal fork pump.