Crafted from aluminium and secured with a single screw, the ACID derailleur guard is a stylish and lightweight solution to the perennial problem of some pannier bags interfering with rear derailleur operation. By holding the bag safely clear of the gears, it ensures smooth gear operation and no damage to the mechanism. It's designed to work with ACID SIC carriers (Rail, RILink and Gravel) but will also works with similar pannier racks.