Mrp 1x v2 upper chain guide alloythe 1x guide is the perfect addition to your drivetrain if you need extra chain retention if your chain drops off the chain ring often or if you would simply like some extra confidence that this will never happen this v2 guide is available for most modern mounting options which includes d mount e mount iscg 05 iscg old and bottom bracket mounting featuressuited to trail cross country and cyclocross ridingadds chainline security to narrowwide 1x1011 and