Designed to minimize chainslap & noise, while ensuring your chain is always right where you want it, the LRP is the best shiftable chain guide on the market. Featuring broad compatibility, & our new " Party Crasher Lite" bash ring, it also sports a new raised profile on the arm which prevent the chain from dropping off the granny ring & into your frame. That's right, no more chewed up, mangled bb shells. With the LRP installed, your bb shell will remain pristine.2-chainring shiftable guide system 235g including bash ringultra quiet urethane roller E-Type, ISCG, ISCG-05, & BB-Mount 32-36T