E thirteen lg1 chain guidethe ultimate in lightweight race day chain retention from the world cup circuit to your home track the all new completely re designed lg1 guide offers the same world class chain retention in a lighter stiffer and far more adjustable design the iscg05 mount holes offer more adjustment than any of the competition and the upperlower sliders have a further range so riders can achieve ideal fit and positioning a modular assembly allows riders to choose from one o