New features for the 2007 x9 trigger shifters include sram39s zero loss travel and adjustable clamp positions just like it39s bigger brother x0 the rear derailleur has also been re designed for 2007 and features a forged b knuckle for improved stiffness and the addition of a short cage option and for the first time there is now a dedicated x9 front derailleur available to complete your drivechain