EXACT ACTUATION for fast and accurate shifts using SRAM’s 1:1 actuation ratio (shifter cable travel: derailleur movement) X-SYNC pulley features a 12-tooth design that helps control the chain’s lateral movement ROLLER BEARING CLUTCH’s one-way roller clutch controls chain tension for consistent shifting X-Horizon straight parallelogram design limits all movement to the horizontal axis, which makes ghost shifting impossible while also reducing shift force Cage Lock technology makes for fast wheel changes or chain installation SRAM Model ID: RD-FRC-1-A2 Specifications Max Front Difference: Single chainring only Maximum Cog: 36T Minimum Cog: 10T Primary Color: Black Cage: Medium Speed: 11 Mount: Standard Special order - ships in 5-10 days from our distributor.