Abstract: A mountable bicycle structure is provided that can be clamped onto different sized tubular members such as handlebars by using different adapter members. The mountable bicycle structure basically includes a component support portion, a tubular clamping portion, a tightening structure and an adapter member. The tubular clamping portion has a split ring configuration to define an adjustable inner diameter that extends around a center axis. The tightening structure is coupled to first and second ends of the tubular clamping portion to selectively reduce the adjustable inner diameter. The adapter member has a split ring configuration with an outer surface removably arranged on the inner surface of the tubular clamping portion. The tubular clamping portion and the adapter member are arranged and configured to align the split of the adapter member with the attachment slot of the tubular clamping portion.

Abstract: A multiple sprocket apparatus for a bicycle includes an inner race and an outer race having first and second end faces rotatably supported by the inner race. The outer race has first end second end faces and is structured for supporting a plurality of first sprockets on an outer peripheral surface thereof and aligned between the first and second end faces. The second end face includes fastening devices for fastening a second sprocket thereto.