The guide that helped Brian Lopes win his fifth-consecutive AIr DH race at Crankworx 2010 is now available! The Lopes SL represents the lightest full chain retention system on the market. At just 100 grams the Lopes SL guide is the obvious choice for 4X, slalom, or all-mountain riders willing to sacrifice bash protection, but not chain retention, in the name of weight savings.