SRAM Force 1 Type 3. 0 Rear Derailleur Make your front derailleur a thing of the past. Put all the gears you need at one fingertip with a spooky-silent drivetrain and fast, quiet shifting. It will change where you ride and the way you ride. It will open new roads. With their new 1x Road lineup, SRAM took what they've learned from their 1x mountain lineup and translated that to Road and CX. Chain tension is carefully managed with the X-Horizon technology which keeps the chain movement horizontal and thus eliminating ghost shifting and reducing shifting force. Wheel changes are a snap with Cage Lock. Simply push the derailleur forward to create slack in the chain and then lock it into place. The Force 1 Derailleur is a thing of beauty. Features A dedicated 1x rear derailleur Uses improved Type 3. 0 roller clutch design EXACT ACTUATION(TM) for fast and accurate shifts using SRAM's 1:1 actuation ratio (shifter cable travel: derailleur movement). 10- and 11-speed compatible X-SYNC(TM) pulley features a 12-tooth design that helps control the chain's lateral movement X-HORIZON(TM) "straight parallelogram" design limits all movement to the horizontal axis, which makes ghost shifting impossible while also reducing shift force ROLLER BEARING CLUTCH(TM)'s one-way roller clutch controls chain tension for consistent shifting Cage Lock(TM) technology makes for fast wheel changes or chain installation Available in Short: 11-26 through 11-28 / Medium: 11-26 through 11-36 / Long 11-32 through 10-42 cage lengths Weight: 261g | Sram | Force 1 Type 3. 0 Rear Derailleur | Gray | Long Cage, 42 Tooth Max