Rhythm Section Expert 28H 20 x 1-3/8" RimsPRODUCT DETAILS The Rhythm BMX Expert 20 x 1 3 8" rim is a double walled racing rim made from 6061 T6 aluminum with a pinned seam and large hollow internal chamber to save weight. Rhythm rims are solid in color and do not have silver side walls (except for the white rim which does have silver side walls). All rims are machined on the brake surface to make the brakes work properly. Available in 28H only Rim is drilled for Presta Valve Click Here for