SRAM Rival AXS Rear Derailleur - 12-Speed 36t Max Battery Not Included Aluminum Cage BLK E1 MFPN=041A920ICA011 but if you need durability

but if you need durability for very aggressive conditions go with Super Base

Professional quality T-Handle hex wrench built for speed efficiency leverage and a perfect fit

Rugged 6061 aluminum construction is corrosion resistant

GRIP Cork Kids

SRAM Rival AXS Rear Derailleur - 12-Speed 36t Max Battery Not Included Aluminum Cage BLK E1 MFPN=041A920ICA011 but if you need durabilitySRAM Rival AXS Rear Derailleur 12 Speed 36t Max (Battery Not Included) Aluminum Cage Black E1. The brains of the operation. The Rival AXS 12 Speed rear derailleur is the choice for road riding for all cassette sizes from 10 28t to 10 36t for any terrain you cover. Precise wireless shifting with advanced chain management lets you ride with confidence anywhere. Chain management technology keeps the drivetrain quiet and secure AXS enabled for easy setup