MRP Long Range Patrol chain retention systems; ISCG or Bottom bracket mount; 30-34t or 34-38t chainring capacities.Designed for use with two chainringsMax-tooth designations references the maximum size of the larger chainringCNC machined alloy boomerangUpper boomerang "fin" keep chain from falling to the inside of the frameE-Type guide allows shimano derailleur to be mounted directly to the boomerangPolycarbonate Lite bashguard features weight reducing relief sectionsUrethane rollersRollers and bashguard are color-matchedItem SpecificationsWeight235gBolt Pattern4-BoltChainring BCD104mmMax Tooth32-36teethChainguide Mount TypeISCGRing SetupDual