Engineered for elite cross-country performance, the XX SL T-Type Transmission Upgrade Kit delivers cutting-edge shifting in SRAM's lightest package yet. The hangerless XX SL derailleur offers increased durability with trusted features like the overload clutch and simple AXS pairing. The XX SL cassette, SRAM's lightest ever, uses full X-SYNC technology for flawless shifting under load—getting smoother the harder you pedal. Paired with the sleek, strong Flattop Chain and the intuitive, two-button AXS Pod Ultimate controller, this system brings modern performance and style to your XC build. This upgrade kit provides all the components needed to elevate your drivetrain to the latest technology, while still allowing you to use your existing cranks or choose an aftermarket option. Note: A compatible T-Type chainring is required. Battery and USB-C charger are included (USB-C cord is not included with the charger) XX SL Eagle Transmission AXS Upgrade Kit Specs: Derailleur Controller Cassette Chain Rear Derailleur Model: XX SL Eagle Transmission Model ID: RD-XX-SLE-B1 Shift Technology: Wireless Communication Protocol: AXS Max Tooth: 52t Cage Material: Carbon Drive Config: 1x Chain Technology: T-Type Weight: 440 Grams Controller Model: AXS Pod Ultimate Model ID: EC-AXS-PODU-D1 Controller Type: Wireless Orientation: Left, Right Clamp: Discrete Cassette Model: XS-1299 Model ID: CS-XS-1299-A1 Freehub Interface: SRAM XD Gearing: 10-52t Cog Finish: Black Technology: XS Cog Sizes: 10-52t:10,12,14,16,18,21,24,28,32,38,44,52 Weight: 350 grams Chain Model: XX SL Eagle Transmission Flattop Model ID: CN-TTYP-XXSL-A1 Outer Link Finish: Nickel Outer Link Color: Silver Inner Link Finish: Chrome Hardened Inner Link Color: Silver Chain Connector: PowerLock 12s T-Type Chain Length: 126 links Pin Variant: Hollow Pin Weight: 240 grams