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XX DH Transmission

When every millisecond counts and the podium is on the line, XX DH Transmission delivers a true edge: full-power shifting under load, confidence-inspiring toughness, and fully focused silence. That means you can drop the hammer without hesitation—out of the start gate, through the motorways, and across the finish line. Built with a Full Mount derailleur, burly, purpose-built aluminum cranks, and a chainring designed to take the hits, it’s made to charge harder, ride faster, and stay composed through whatever chaos the track throws at you. It’s calm in the storm, letting you stay locked in on the run that matters most.

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SRAM XX DH AXS Downhill Transmission

TOUGH RACE-DEVELOPED COMPONENTS PROVIDE CONFIDENENCE

CASSETTE MAPPING FOR PRECISE FASTER ON-TRACK SHIFTING

SILENT PERFORMANCE KEEPS YOU LOCKED ON EVERY LINE

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World cup riders on XX DH Transmission

Best shift
under load.

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It pays to shift

DH racers routinely push E-MTB level wattage out of the start gate or into the finish line. With traditional cog-and-chain technology, they may lose up to half their power during a shift as they momentarily ease off to let the chain disengage and re-engage safely. This means they’re giving up time and pace with every shift. XX DH’s Cassette Mapping means you never need to let up, allowing for full power through every shift, with no loss in momentum. This means that every shift is faster, helping you bank milliseconds with every gear step. No hesitation, no let-up, just pure race pace.

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Advantage, precision

The 7-speed XX DH Transmission cassette is built with the right steps to deliver big power. Its full X-SYNC tooth profile design makes it the foundation of our most confident and fastest downhill shift yet. Paired with an AXS firmware-driven shift sequence, it unlocks Cassette Mapping which maintains continuous chain engagement for pure, uninterrupted power transfer.

Max Alran riding XX DH to UCI World Cup podium

Tough and robust.

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Locked in

The strongest DH derailleur available. Period. Utilizing the now standard Hangerless Interface, XX DH takes the same architecture as our other Transmission derailleurs and delivers an even more robust, DH-focused design ready for World Cup start huts or the gnarliest freeride lines. Full Mount clamps around both sides of the frame itself and eliminates the need for a hanger and allows the derailleur to rotate backward in the case of an impact.

Tight and tidy

With a Full Mount derailleur positioned as far inboard as possible, XX DH sits out of harm’s way. And as more downhill bikes incorporate the 148mm rear hub standard, derailleur and rotors move inboard, and your heels gain more clearance from the bike. Taking it further, the XD SLIM hub standard allows the narrowest possible 7-speed cassette and a symmetric spoke bracing angle for stronger, faster wheel builds and even tensioning. Together, these elements form a complete drivetrain, wheel, and brake system optimized for maximum clearance and superior race tuning.

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Machined for wear

Taking cues from our best aluminum crank, we designed ground up for a purpose-built, battle-ready DH crankset. The robust XX DH arms feature machined surfaces in high-wear and rock strike prone areas. Keeping your cranks looking fresh for longer.

SRAM XX DH Short cranks

Short or shorter

For greater ground clearance and more weight balance adjustment options, XX DH crank arms are available in progressively short lengths from 165mm through 150mm.

SRAM XX DH Rebuildable rear derailleur

Built to send

Built for the realities of getting off your line, the XX DH rear derailleur features rebuildable components: skid plates, outer link, and the DH-optimized Inline Cage.

SRAM XX DH chainring specifically designed to reduce wear and tear

The last chainring standing

By increasing folding and impact resistance, the all-new XX DH T-Type chainring is specifically designed to withstand the heaviest demands of downhill riding.

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Hear yourself think.

Downhill is loud, but XX DH stays silent—no rattle, no slap, just pure, focused performance.

Calm under chaos

Rowdy DH terrain throws your drivetrain into the blender, but XX DH fights back by pairing the proven Type 4 Transmission damper with a super compact cage. Less leverage means more chain control, so when the terrain turns chaotic, your drivetrain doesn’t.

Ochain ready

For top-step descending performance, pair XX DH with an Ochain spider damper. Ochain absorbs pedal feedback to deliver unmatched traction, control, and confidence. The 104bcd XX T-Type chainring ensures full compatibility for better chain retention and a smoother, more confident pedal feel.

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Chained together

XX DH Transmission isn’t Eagle, but it taps into the Eagle Transmission Ecosystem where it counts. Shared T-Type components open the door for more mix-and-match flexibility across builds. At the heart of the system is the XX Eagle Transmission Flattop Chain with a hollow-pin design and Hard Chrome finish delivering maximum strength, long-haul durability. And for slopestyle or aggressive Enduro builds, XX DH cranksets are available with DUB MTB Wide spindles for 55mm chainline.

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World Cup mechanics working on SRAM XX DH Transmission

Simple.

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Time in the pits is practice time missed. That’s why XX DH uses a similar prepare, hang, tighten set up procedure as Eagle Transmission, making rebuilds and swap-outs as efficient as possible. And for the first time, AXS comes to downhill, eliminating cable housing contamination, routing complexity, and number plate interference.

SRAM XX DH Cockpit

Your pod, your position

With AXS, personalization is literally at your fingertips. AXS Pod controllers offer precise ergonomic adjustment, letting riders fine-tune button angle and reach for optimal control on rough DH terrain.

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Podium proven and ready to race

Raced to multiple World Cup wins and a UCI World Championship, XX DH is our highest-performing downhill groupset. Its proven best-in-class shift under load performance helps you find valuable milliseconds, while burly race-developed components provide confidence to charge off the line with zero hesitation. Add the finishing touch: bold black ano with silver-machined details for a classy look worthy of the XX mark.

Welcome to XX DH Transmission

Before you hit the track, read on to get to know the basics of XX DH Transmission (then go shave some time off your lap).

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