A wheelchair suspension comprising: a frame; a drive assembly pivot arm pivotally connected to the frame; a drive assembly including a drive wheel, wherein the drive assembly is mounted to the drive assembly pivot arm; at least one front caster pivot arm pivotally mounted to the frame and coupled to the drive assembly pivot arm; a front caster coupled to the at least one front caster pivot arm; a spring and shock absorbing assembly pivotally connected to the drive assembly pivot arm at a first pivotal connection and pivotally connected to the front caster pivot arm at a second pivotal connection; characterized by the first and second pivotal connections being positioned such that a majority of the force applied by the spring and shock absorbing assembly is applied to the drive wheel when the suspension is on a flat, horizontal support surface; such that traction between the drive wheel and the support surface and the ease with which the front caster can climb an obstacle are enhanced, wherein a first angle (Ω) between a line that connects the first and second pivotal connections and line that connects the first pivotal connection and a third pivotal connection where the drive assembly pivot arm is pivotally connected to the frame is between 60 and 120 degrees when the suspension is on a flat, horizontal support surface; and wherein a second angle (ψ) between a line that connects the first and second pivotal connections and line that connects the second pivotal connection and a fourth pivotal connection where the front caster pivot arm is pivotally connected to the frame is between 0 and 30 degrees when the suspension is on a flat, horizontal support surface. a frame; a drive assembly pivot arm pivotally connected to the frame; a drive assembly including a drive wheel, wherein the drive assembly is mounted to the drive assembly pivot arm; at least one front caster pivot arm pivotally mounted to the frame and coupled to the drive assembly pivot arm; a front caster coupled to the at least one front caster pivot arm; a spring and shock absorbing assembly pivotally connected to the drive assembly pivot arm at a first pivotal connection and pivotally connected to the front caster pivot arm at a second pivotal connection; characterized by the first and second pivotal connections being positioned such that a majority of the force applied by the spring and shock absorbing assembly is applied to the drive wheel when the suspension is on a flat, horizontal support surface; such that traction between the drive wheel and the support surface and the ease with which the front caster can climb an obstacle are enhanced, wherein a first angle (Ω) between a line that connects the first and second pivotal connections and line that connects the first pivotal connection and a third pivotal connection where the drive assembly pivot arm is pivotally connected to the frame is between 60 and 120 degrees when the suspension is on a flat, horizontal support surface; and wherein a second angle (ψ) between a line that connects the first and second pivotal connections and line that connects the second pivotal connection and a fourth pivotal connection where the front caster pivot arm is pivotally connected to the frame is between 0 and 30 degrees when the suspension is on a flat, horizontal support surface.