That offset top jockey wheel helps it follow the arc of the larger cassette, but it does mean it's no longer 2X compatible, so you'll be limited to just two cassette sizes - the new XPLR 10-44T cassette, or the existing 10-36T.Īt the Red level, you get an alloy cage (rather than carbon), so the overall weight gap between top-spec Red XPLR and bottom-spec Rival XPLR is reduced. XPLR rear derailleurs get a new upper ‘B knuckle’ and offset top jockey wheel to handle the larger cassette but otherwise, the mixed metal structure is the same. (Image credit: Guy Kesteven) SRAM Rival eTap AXS XPLR rear derailleur
