The SRAM Rival AXS E1 12-Speed 36T Rear Derailleur delivers fast wireless shifting, wide cassette compatibility, and dependable chain control for confident road performance. Built for smooth operation across 1x and 2x drivetrains, it features intelligent chain management and simple AXS setup. From rolling flats to steep climbs, it adapts to every road and rider.Key Features and Benefits:AXS wireless shifting system: Provides precise, cable-free gear changes with consistent accuracy. This reduces setup time, removes cable maintenance, and ensures reliable shifting performance over time.Advanced chain management technology: Keeps the chain tight and quiet, even on rough roads. This improves drivetrain security and extends component life, letting riders focus on speed, not noise or dropped chains.Wide cassette compatibility (10-28T to 10-36T): Supports a broad range of gearing setups. This flexibility allows riders to tailor their drivetrain to flat roads, rolling terrain, or steep climbs with ease.1x and 2x drivetrain support: Works seamlessly with both single and double chainring systems. This means it can be used across a variety of bike builds, reducing the need for component changes.Larger X-SYNC lower pulley: Increases drivetrain efficiency by improving chain control and reducing friction. This leads to smoother pedalling and better power transfer under load.AXS personalisation and setup tools: Allows easy configuration through the SRAM AXS app. This simplifies tuning and ensures that shifting performance stays aligned with rider preferences and bike fit.Whether you're chasing reliable shifting for endurance rides or flexibility for mixed terrain, this derailleur offers the performance and range riders need. Its wireless setup reduces clutter and maintenance, while its smart chain management ensures smooth, secure riding across varied gradients.Upgrade your drivetrain with a system built for precision, simplicity, and adaptability on any road.Specification: Speed (RD): 12Cable pull ratio: n/aCage (RD): n/aMax tooth: 36Colour (RD): Black/GreyPulley bearings material: SteelCage material (RD): AluminiumDrivetrain Configuration: 2xCommunication Protocol: AXSShift Technology: WirelessChain Technology: Road Flattop D1, Road Flattop E1Battery Not Included