XX Downhill AXS Transmission Rear Derailleur

What Our Gearhead® Experts Are Saying:

"I’ve set this up on a couple of park and race builds, and it’s hands-down the most solid DH derailleur I’ve used. The Full Mount interface feels planted, and you can shift at full sprint without backing off. It’s noticeably quieter through braking bumps too—the shorter cage and Type 4 damper really keep things controlled."

When the start gate drops and every line choice carries consequence, we trust the XX Downhill AXS Transmission Rear Derailleur to stay composed. Built by SRAM specifically for gravity racing, it’s engineered for moments when riders are pushing E-MTB-level power out of the gate and never letting up. We shift under full load without hesitation, carrying speed into splits instead of giving it away.

The Full Mount, hangerless interface clamps directly to the frame for unmatched alignment and impact resistance, allowing the derailleur to rotate rearward in a crash rather than snap a hanger. Its DH-optimized Inline Cage is shorter and more compact than traditional designs, reducing leverage and improving chain control in blown-out terrain. Paired with the proven Type 4 damper, it runs remarkably quiet through chatter and square edges. Cassette Mapping and AXS integration maintain constant chain engagement during shifts, delivering uninterrupted power transfer across the 7-speed T-Type system. Replaceable skid plates, outer link components, and a rebuildable cage assembly ensure it’s ready for long seasons of hard racing.