Sram force 1 11 speed rear derailleurcyclocross specific, the force 1 derailleur brings you the same toughness and slick shifting ability of srams mountain bike mtb range'. '.strtoupper('d')esigned for 1x11 speed drivetrains and equipped with fully sealed bearings, its ready for the harshest trails.quiet and smooth shifting performancethe internal clutch design eliminates chain slack, making it almost impossible for the chain to fall off the chainring whilst cycling a real benefit when riding on rough terrain'. '.strtoupper('i')t also creates a noticeably smoother, quieter and higher performing drivetrain configuration for your bike.features cage material aluminium pulley jockey wheel bearings steel sealed cartridge bearings pulley jockey wheel tooth count 12t speed 11 speed compatibility sram force and all sram drop bar 11 speed shifters mounting standard hanger mount clutch type yes cable pull ratio exact actuation maximum sprocket size short cage 26t medium cage 36t long cage 42t manufacturer's part number rd frc 1 a2 weight short cage 430g medium cage 434g long cage 439gtechnologies cage lock wheel removal and installation, as well as chain installation, becomes faster and simpler'. '.strtoupper('j')ust push the cage forward to create slack and lock it into place x sync the x sync pulley features a 12 tooth design that helps control the chains lateral movement roller bearing clutch  maximum drivetrain stability even through the most punishing terrain'. '.strtoupper('w')ith roller bearing clutch technology, derailleur bounce and chain slap are eliminated without sacrificing precision exact actuation simplified and stabilised shifting over tight cog spacing found on modern cassettes'. '.strtoupper('b')y using exact cable tension, the end result is the easiest index shifting system to set up and it stays that way x horizon the lsquostraight parallelogram design limits all movement to the horizontal axis, which makes ghost shifting impossible while also reducing shift force'. '.strtoupper('f')or quicker, more exact shifting, the large upper pulley offset design maintains a constant chain gap across all gearsbuy sram components from chain reaction cycles, the world's largest online bike store.