11-19 KTM 250SX: Acerbis Chain Guide/Slider Kit (BLACK) The Acerbis Chain Guide / Slider Kit is the perfect solution for replacing the high-wear area of your bike's drivetrain. Acerbis Chain Slider (Swing Arm Rub Plate): Wear and tear on your motorcycle is part of the game, but it does not have to be expensive thanks to Acerbis and their Swing Arm Rub Plate. The Acerbis rub plate is constructed out of durable rubber and formed to match O.E.M. specifications. Installation is a cinch with this rub plate with the use of the O.E.M.