Unior 689/2BI inner bearing PullerProduct features A 1kg (2. 2lb) slide hammer is attached to an expanding collet, which when fitted to a bearing, provides a quick and easy method of removing nearly any press fit bearing. Since the collets each fit a range of sizes, it's unlikely you'll find a bearing on a bike that this won't work with. Included with the 689 2BI bearing puller set are collets for bearings with an inner diameter of 6. 5 8mm, 10 12mm, 12 15mm, 17 20mm, 22 28mm, and 30