SRAM Rival 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 and will open new roads. Designed to control chain movement, the SRAM Rival 1 Type 3. 0 Rear Derailleur shifts smoothly, quickly and crisply. 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. Open the road with Rival 1. Features A dedicated 1x rear derailleur Uses improved Type 3. 0 roller clutch design X-HORIZON(TM) design reduces shift force while eliminating ghost shifting and chain slap Large upper pulley offset automatically adjusts chain gap Sealed cartridge bearings and aluminum cage Technologies: X-HORIZON(TM), EXACT ACTUATION(TM), X-SYNC(TM), ROLLER BEARING CLUTCH(TM), Cage Lock(TM)Medium cage: 11-26 through 11-36 cassettes (269g)Long cage: 10-42 cassette | Sram | Rival 1 Type 3. 0 Rear Derailleur Black/silv, Medium Cage, 36 Tooth Max