A slide assembly with quick-mount system includes an outer rail, an intermediate rail, an inner rail and a ball bearing retainer. The intermediate rail has a notch. The inner rail has a first slot and a second slot to accommodate first and second mounts of an installed member. The ball bearing retainer has an upper member and a bottom member. The upper and bottom members each have retaining sections. Each retaining section has a ball bearing. The distance between adjacent retaining sections is larger than the diameter of the first mount. When the inner rail is pulled out relative to the intermediate rail, the first slot is located corresponding to the notch and between any two of the retaining sections, the first mount extends through the notch and enters into the first slot to be positioned. The second mount is engaged with the second slot of the inner rail.