Long Range Patrol offers two ring shifting combined with secure chain retention. New design features upper fin to prevent chain loss. Includes Party Crasher Lite bash guard, 32t 36t capacity. E-type models feature an updated bracket for Shimano E-type front derailleurs. ISCG, ISCG-05, or BB mounting options, 4B/104 BCD only. Features: Designed for use with two chainrings Max-tooth designations references the maximum size of the larger chainring CNC machined alloy boomerang Upper boomerang "fin" keep chain from falling to the inside of the frame E-Type guide allows shimano derailleur to be mounted directly to the boomerang Polycarbonate Lite bashguard features weight reducing relief sections Urethane rollers Rollers and bashguard are color-matched