DT Swiss EX 511 Rim - 29" Disc Black 28HDT Swiss EX 511 Rim 29" Disc Black 28H. The EX 511 rim was designed to meet the needs of riders that want to ride burlier terrain faster and faster. It comes with all the technology that has delivered many EWS wins and packs it in a 30 mm wide profile. 2. 0 silver alloy Prolock Squorx Pro Head nipples and PHR washers included The wheel must be built with the supplied PHR washers and Pro Head nipples. The PHR washer must be positioned between the