RIM STRUCTURE FOR BIKE

A rim structure for a bike is revealed. A rim (1) comprises two side walls (11), a connection wall (12) for connecting opposite end faces of the two side walls (11), an inner wall (13) for connecting the inner edges of the two side walls (11), and a space (14) defined by the two side walls (11), the connection wall (12) and the inner wall (13). The inner wall (13) has a plurality of evenly-spaced spokes (2) thereon, each of which has a head (21) located inside the space (14). The space (14) is filled with a foam material.