SRAM AXS XO Transmission

Cutting-edge wireless drivetrain for elite XC racing.

Why I like it

The SRAM AXS XO Transmission is absolutely rock solid. I’m running it on my Epic 8, and it’s been a complete game-changer compared to cable setups or even first-gen AXS.

Shifting under load is incredibly smooth — no hesitation, no quirks. As long as the chain is healthy, the axle is tight, and setup was done properly, the system just works without drama.

The real-world durability is also insane. I’ve slammed this derailleur into rocks hard enough to leave scars, but it’s never misaligned or misbehaved afterward. I would never go back to a hanger-based derailleur.

Quick Specs

Wireless shifting (no derailleur hanger required)
Fully integrated system design
Rock-solid performance under load
Race-proven durability

In My Setup

Installed on my Specialized Epic 8.
Setup is super straightforward — no cable tensioning, limit screws, B-screw fiddling, or bent hanger voodoo.
Battery life is awesome — easily lasts a full week of heavy training and riding.
I haven’t even felt the need to tweak anything through the SRAM app yet.
Watch SRAM’s official setup video if you’re new to Transmission — it’s way easier than you might expect:
SRAM XO Transmission Setup Video

Who It’s For

Everyone.
Whether you’re racing at the front of an XC field or just want a drivetrain that feels futuristic and maintenance-free, Transmission is a major leap forward. Anything else feels like a step backward now.

Notes

Get used to the idea that setup is easier than cable drivetrains — it feels wrong at first because it’s so simple.
No hanger = no hanger drama. That’s worth it alone.
Keep an eye on chain health. A bad link can cause weirdness (as with any system), but otherwise, Transmission is nearly bombproof.