Methods and apparatus for combined variable damping and variable spring rate suspension

A vehicle suspension damper comprising:

• a cylinder;
• a piston assembly comprising a piston and piston rod within said cylinder;
• a first chamber within said cylinder, said first chamber having a first pressure and a working fluid therein;
• a second chamber within said cylinder, said second chamber having a second pressure, the second chamber fluidly isolated from said first chamber and having pressurized gas therein, said second chamber having a portion thereof disposed in said piston;
• a pressure-sensitive valve disposed in said piston, said pressure-sensitive valve further disposed between the first chamber and the second chamber such that said first chamber is adjacent a first side of said pressure sensitive valve, and such that said second chamber is adjacent a second side of said pressure sensitive valve, the valve including:
• a first valve surface in communication with the pressurized gas;
• and
• an opposing valve surface in communication with the working fluid;
• and
• a suspension gas spring coupled with said cylinder, said suspension gas spring comprising:
• an enclosure, said enclosure movable with respect to said cylinder;
• and
• a third chamber at least partially enclosed by said enclosure, said third chamber having a third pressure, said third chamber fluidly coupled with said second chamber, wherein a pressure change of said third pressure within said suspension gas spring will cause a pressure change to said second pressure within said cylinder.