Suspension for a vehicle comprising: a strut assembly including a first and a second longitudinal reinforcement member, the first longitudinal reinforcement member disposed within and slidable relative to the second longitudinal reinforcement member, wherein said first and second longitudinal reinforcement members comprise a stanchion and a slider respectively; wherein the longitudinal reinforcement members are rotatable relative to one another between a first position in which the strut assembly has a first stiffness in a plane substantially coincident with a fore / aft direction and an up / down direction relative to the vehicle and a second position in which the strut assembly has a second stiffness, in the plane, that is lower than the first stiffness; and wherein one of said first and second longitudinal reinforcement members (8, 9) comprises a portion of non-circular shape with a major dimension greater than a minor dimension, the arrangement being such that, in use, the stiffness in the first position results from the major dimension being substantially aligned with the plane; and the suspension further comprising a mounting device (7, 20) for selectively retaining the longitudinal reinforcement members (8, 9) in the first position, characterized in that the suspension further comprises a bushing having an inner surface substantially conforming to said non-circular shape, and an outer surface of substantially circular shape, whereby using said outer surface said stanchion or slider may be mounted on a vehicle via said mounting device (7, 20), such as a triple clamp, and readily rotated when said mounting device is released. a strut assembly including a first and a second longitudinal reinforcement member, the first longitudinal reinforcement member disposed within and slidable relative to the second longitudinal reinforcement member, wherein said first and second longitudinal reinforcement members comprise a stanchion and a slider respectively; wherein the longitudinal reinforcement members are rotatable relative to one another between a first position in which the strut assembly has a first stiffness in a plane substantially coincident with a fore / aft direction and an up / down direction relative to the vehicle and a second position in which the strut assembly has a second stiffness, in the plane, that is lower than the first stiffness; and wherein one of said first and second longitudinal reinforcement members (8, 9) comprises a portion of non-circular shape with a major dimension greater than a minor dimension, the arrangement being such that, in use, the stiffness in the first position results from the major dimension being substantially aligned with the plane; and the suspension further comprising a mounting device (7, 20) for selectively retaining the longitudinal reinforcement members (8, 9) in the first position, characterized in that the suspension further comprises a bushing having an inner surface substantially conforming to said non-circular shape, and an outer surface of substantially circular shape, whereby using said outer surface said stanchion or slider may be mounted on a vehicle via said mounting device (7, 20), such as a triple clamp, and readily rotated when said mounting device is released.