SRAM Launches Wireless Eagle AXS Drivetrains and RockShox Reverb Dropper

Date Feb 6, 2019

If you haven't yet read our riding impressions on the new SRAM Eagle AXS electronic wireless drivetrain and Reverb dropper post, go check it out here. Otherwise, read on for the tech details, pricing, and availability of this futuristic groupset. Text, video, and photography below the break are from SRAM's press release.


Technology For Simplicity. 

At a glance, Eagle AXS™ brings the real benefits of wireless electronic shifting to the mountain bike. On a deeper level, it offers discerning riders unprecedented personalization and control of the drivetrain. On the bike and off. Deepening the relationship between machine and rider. This addition to the Eagle™ ecosystem enhances capability. Removes complexity. And provides riders an experience like never before imagined.


Both XX1 Eagle AXS™ and X01 Eagle AXS™ combine the proven, dedicated 1x backbone of Eagle™ with a connected wireless electronic derailleur and controller. With completely new inputs at the bar that initiate a shift with a touch. It’s an all-new derailleur that’s specifically designed and optimized to be motor-driven instead of cable-actuated, to truly leverage what this allows. AXS™ powered components enable customization and scale to an individual rider’s liking via the AXS™ app.

The pure shifting performance of Eagle AXS™ is the real difference maker. Shift under load, over the roughest terrain, uphill, or without changing your grip on the bar. Eagle AXS™ changes your level of control on the bike when you’re under pressure and pushing hard into the red. But more than that, it changes your relationship with the bike.



XC spec and ready for the trail. XX1 Eagle AXS™ utilizes the proven backbone of SRAM 1x™. With the lightest weight materials and a 500-percent gear range. More secure and longer wearing X-SYNC™2 chainring. The pinnacle of performance, paired with the connected components of Eagle AXS™. Ready for the new generation of super bikes.




SRAM's most famous AXS product tester - who used the group to multiple wins - was reigning World and Olumpic XC champion Nino Schurter.

SRAM X01 Eagle AXS™

There’s an element of the unknown when it comes to running new trail and racing blind. Enduro spec follows suit. X01 Eagle AXS™ utilizes the proven backbone of SRAM 1x™. 500-percent gear range. More secure and longer wearing X-SYNC™2 chainring. The resilience of an aluminum cage, paired with the connected components of Eagle AXS™. Ready for the new generation of super bikes.




Eagle AXS™ Derailleur

More than a mechanical derailleur with a battery and a motor bolted on, the Eagle AXS™ derailleur is the brain of the whole AXS™ system. Trim it at set-up for zero rub, making the near-silent operation of Eagle™ even more stealth—all while improving drivetrain longevity.

It features a shorter cage for 10mm more ground clearance, with more chain wrap on the cassette to sit slightly further forward, and further inboard from mechanical Eagle™. Instantaneous shifts from a single touch even while under World Cup-winning chain loads recorded in the heat of racing and affirmed in the test lab.


Eagle AXS™ Controller

No cable, housing or wires to manage opened up design and engineering possibilities with the Eagle AXS™ controller. Helping us pioneer a completely new shifting experience with new ergonomic touchpoints that take just enough effort to press.

Touchpoints that are totally customizable to your preferences, allowing you to choose which button does what through the AXS™ app. Choose from three functions: Inboard shift. Outboard shift. Dropper. Use one of the touchpoints to control your electronic Reverb AXS™ dropper seatpost. And the power save mode in the controller wakes up after a single touch to save battery when not in use.


The Secret Sprint Paddle

Beyond the controller’s standard paddle, an included “Secret Sprint” paddle oriented on the front-side of the controller near your index knuckle allows for quick shifts with virtually no change to your grip on the handlebar. 


The Secret Sprint Paddle was developed and perfected with input from Nino, who was looking for a way to shift up while sprinting - a situation he finds himself in often at the end of World Cup races. Whether the every day user will make as much use of it remains to be seen.

Easy Setup Easier Usage

Bolt it on. Set three limit screws. Press the pairing buttons. And go. Eagle AXS™ is trimmed and adjusted electronically for a perfect chainline. There is no additional effort to shift or idiosyncrasies to learn. And AXS™ unlocks an entirely new way to personalize the key interface with your bike—all controlled from your phone via a simple AXS™ app. Unless you’re looking to set it and forget it. Because you can do that too.


A bit about the battery.

Yes, Eagle AXS™ uses a battery. One that is removable for easy recharging after 20 hours of ride time*. One that only weighs 25g and is detachable with a single clip. One that is “hot swappable” if needed—from derailleur to your Reverb AXS™ seatpost or even your SRAM RED eTap AXS™ road group. And it only takes an hour to charge.

Know before you go.

Checking battery life is easy: Press the button on the derailleur. Green light means it’s at or close to full charge. Red light means it’s at or close to half charge. And flashing red means charge it up. Or throw on another, because keeping an extra is easy and realistic. To prolong battery life, the system goes to power save mode when the bike is stationery.

Yeah, it’s waterproof.

The Eagle AXS™ system is completely water and dust proof to the IP69K international standard. Initially developed for construction vehicles and food sanitization, the IP69K standard validates systems that require regular pressurized cleaning. For a mountain biker, it means no hesitation to head out when the weather looks less than ideal.


Go ahead and ride in the wet and mud. Spray it down with a hose. SRAM's Eagle AXS group is water and dust proof to the IP69K international standard.

Eagle AXS Impact Protection

The Eagle AXS™ derailleur is smart enough to protect itself. The built-in Overload Clutch was designed to disengage on impact, return to position and shift back into gear.
The primary purpose of the Overload Clutch is to protect the derailleur’s shift motor, but it serves to protect your derailleur and derailleur hanger from damage as a by-product. A very helpful by-product.

10mm more cage ground clearance
Type-3 Roller Bearing Clutch™
X-HORIZON™ actuation
Overload Clutch protection


Smashing your rear derailleur is an even scarier proposition now that it's housing a motor and battery. Thankfully, Eagle AXS derailleurs come equipped with an overload clutch - when it senses an impact, it tucks itself out of the way, instantly springing back into position once the impact has passed.


The AXS™ app is the built-in componentry software that makes it possible to both program and personalize Eagle AXS™ to your specifications. Letting you adjust and personalize controller assignments for shift commands and your electronically activated Reverb™ dropper post right from your mobile—to make it exactly how you want it. Have your left controller do upshifts or downshifts. 

Assign a paddle to your AXS™ enabled Reverb™ that feels most intuitive to you. For the first time, AXS™ introduces digital possibilities for riders to customize, personalize, control, and improve the ride. Even when off the bike. Effectively allowing you to create your very own Eagle AXS™ “fingerprint.” 

Use it. Or don’t. 

All that’s needed to get riding is to mount the Eagle AXS™ drivetrain, pair it and get out there. The AXS™ app is only needed for further personalization or to gain access to the data the system has accumulated. Whenever you choose.

Beyond personalization.

Far beyond rider personalization, the seamless integration between AXS™ hardware and software communicates with your SRAMid. Like sending service reminders when it’s time to check your wear components. And so much more. Allowing you to improve your bike when you’re not even touching it. 

Built for riders’ sake not tech’s sake

Riders haven’t asked for this product, because it was never possible before. We didn’t employ the magic of wireless electronics for effect either. We engineered hardware with a new ergonomic experience based on touching a button rather than pushing a lever. Giving you faster, more consistent shifts. Letting you shift when you want, under load, without ever having to plan around terrain.

AXS Phone

The AXS app allows for button customization and will do things like track your mileage and suggest maintenance - if you want it to. You can also use it to set up your Eagle AXS drivetrain or AXS Reverb once and then never use it again. Up to you.

RockShox Reverb AXS


Our intention with Reverb AXS™ was inventive and pure: No hoses. No routing. No energy wasted. Not a single thing in the way of the experience. We created a reliable wireless-electronic dropper post and controller that actuates with drastically less effort and zero distraction. Expanding what’s ever possible on a bike, Reverb AXS™ is enabled by SRAM AXS™ technology, a new level of interaction, personalization, and connectivity across all AXS™ enabled components.


A touch of genius

Effortless wireless-electronic actuation and infinite height adjustment with a single touch.

The wireless-electronic Reverb AXS™ is all Reverb, revamped with a controller you touch instead of a lever you throw. The perfect speed. Its infinite range lets you set it right where you need it, saving you time, energy, and keeping your focus on the trail ahead.


It’s 2019. Let’s make things easy.

Clean, simple and fast to install. No hoses to route, no fishing required

Cutting out the cables makes set up fast and easy. No external hoses. No internal routing. No energy wasted. The Reverb AXS™ complete wireless design is fast to install, and easy to pair. Complimented with an all-new post head, the turn of a single rail-retention bolt makes for a quick and effortless saddle install. Make it perfect with one additional bolt at the front of the head for tilt-adjust and position lock. Drop it in, and send it down.


Internal Affairs

Updated internals for faster return speed in all conditions.

Reverb AXS™ is built with a next-generation, lower friction internal floating piston for faster post actuation and less downward saddle force needed from the rider. Featuring a new lubrication design, we cut eliminated even more friction and created smoother more reliable post performance. Find confidence by activating your dropper more often, with less effort, in any condition, over and over again.

Vent Valve Technology

We don’t want you to have to use it, which is why we’ve created the most robust seatpost to date. 

We also know, sometimes the inevitable happens. Over time, air and oil may mix, resulting in that annoying post “squish” 

and the need for additional service. Vent Valve Technology allows you to do this simple service within a few steps, without any disassembly of the post. Depress the valve, compress the post, good to go. The air is channeled back into the air chamber leaving the oil where it belongs and you back to more confident reliable performance.


Tech Details


30.9mm, 31.6mm, 34.9mm


100mm, 125mm, 150mm, 170mm


340mm, 390mm, 440mm, 480mm


Seatpost: SRAM Battery 

Controller: CR2032


Zero Offset, 7mm Round Rail, 7X9mm Oval Rail, Matchmaker™or Discrete Clamp

AXS Pricing

AXS Pricing Sheet

RockShox Reverb AXS - $800 USD | €800* | £700* (*Includes VAT)


SRAM Eagle AXS drivetrains and RockShox AXS Reverb units will be available for aftermarket purchase in April of 2019. 

Once again, make sure to check out our Ride Impressions article for SRAM Eagle AXS.

Trending on NSMB


Reed Holden  - Feb. 6, 2019, 7:47 a.m.

The wires of the DI2 system with the battery in the middle that really has no place on most bikes turned me off the shimano system. It seemed so stupid that in this day and age, they included wires in electronic shifting. Now sram is making it hard for me not to go electronic. All my arguments against electronic shifting pretty much go out the window with the sram system. I won't be buying it but if it comes stock on my next bike, I suspect I will leave it on.


AndrewR  - Feb. 6, 2019, 9:12 a.m.

Except Di2 shifts perfectly every time and the battery means that you are thinking of charging in terms of months rather than hours. Good luck doing a back country multi-day on AXS (hoping that it can be recharged from a power pack) where as I can confidently do a six day trip and a 14 day work phase without worrying about my battery life with Di2 on my bike. Yes wireless would be great but there is a good reason that Shimano stuck with e-tubes and a battery.

+1 Luix
Pete Roggeman  - Feb. 6, 2019, 10:13 a.m.

Andrew, while I haven't seen the charger, my understanding is that yes, you could simply plug it into a power pack, and I don't imagine it's very big.

I'm also very curious to see what 20 hours of riding time actually equates to in real world ride time. Is that 20 hours of XC racing? If so, I'd bet that riding in conditions where you aren't shifting as much would allow you to squeeze a lot more time out of a battery. Ditto if you're using a post in terrain where you're not going up and down a lot - you could easily swap your batteries at the end of each day so that your derailleur battery is always fresher. Or carry a spare or two.


Jacob Richard  - Feb. 7, 2019, 10:07 a.m.

You would have no issue with a second battery you would have 40+ hours of riding. You don't have to be anywhere near a charger


+1 AJ Barlas
IslandLife  - Feb. 6, 2019, 1:10 p.m.

Oof, must be a tough day over at Shimano!  Not only are they 3 years late (and counting...) to the 12x 500% game, but now Di2 has just been rendered obsolete.


+2 Andy Eunson AlanB
Andrew Major  - Feb. 6, 2019, 2:53 p.m.

I think the counter narrative is that Shimano is playing a long game and their long game is e-bikes.

Their new 10t compatible driver is e-bike friendly, XD is not. Di2 (and Fox Live Valve) are hard wired which means the whole vehicle can run off a single battery/single charge point - motor, shifting, dropper, suspension, brakes, accessories.

On its face wireless is really neat but how many individual batteries does the ‘rider of the future’ end up charging vs a cleanly run wiring harness - motor, shifter, derailleur, fork, shock, dropper, fork remote, shock remote, dropper remote.

Look at where Di2 road has gone with the wiring harness hidden inside bar, stem, and frame and it’s easy to picture a clean MTB setup including suspension and dropper doing the same.

I suppose it would be easy enough for SRAM to replace the derailleur battery with a plug if e-bikes do take over the high end market.

Anyways, have to admit it’s a very clean looking adaptation of technology. Hope the new rear derailleur architecture trickles down to cable systems.


IslandLife  - Feb. 6, 2019, 4:42 p.m.

I'm pretty sure SRAM isn't not thinking about the long game... but I think you answered your own question.  On an ebike, it would be quite simple to power the derailleur and dropper with a plug system (they may already have that half-baked... it would make sense) and leave the shifter alone... 2 years on those easily replaceable batteries is fine and power line valve from that same battery.  And so, in my mind it makes this system even better when it comes to compatibility on various types of bikes at various price points... pick and choose what you want based on budget, preference and application and you end up with as clean as a bike as you can afford.

But you're right... I don't have all the info on e-bike parts and specsm, but if SRAM doesn't have an ebike capable cassette and/or hub standard, they probably need to get on that.  But again, going down that route, could they not just create something that also works with all their other eagle offerings so far?  Thereby completing the cycle?  Offering something for everyone, again just pick the parts and application.

Shimano has some serious catching up to do short term and if all it takes for SRAM to cover it's long term position is to finish off some plugs and build an ebike cassette/hub... it's going to make it tough for Shimano to catch up and win back market share.

Although, I do think Shimano's saving grace will be that their product ultimately will be better than Eagle.  I think when it drops, tests will bear that out, consumers will demand it and Shimano should be able to gain share again.... we'll see.

They're going to need it as I'm sure Shimano's MTB financials must not be pretty to look at right now.


Andrew Major  - Feb. 6, 2019, 7:15 p.m.

SRAM just uses the old standard cassette driver (11-50) for their E-Bike setups.

I wasn’t intending a dig at SRAM at all, just a commentary on Shimano vs. wireless. I think SRAM’s bringing an impressive product to market.


IslandLife  - Feb. 7, 2019, 1:26 p.m.

Totally got that and ya makes sense... interesting times!!  In the end.. great time to be a mountain biker that's for sure!!


Andy Eunson  - Feb. 6, 2019, 6:22 p.m.

Can someone explain why the Magura Veyron actuated so slowly? What was Magura thinking? There has to be a real advantage to electronically controlled stuff not a disadvantage.


+1 Andy Eunson
AJ Barlas  - Feb. 6, 2019, 7:02 p.m.

From my review of the Magura post back in 2016 for Vital: 

The delay is a result of the time it takes for the electronics to communicate and the hydraulic clamping mechanism to actuate within the post. During the development process Magura made a version that worked more quickly thanks to the use of magnets, but the force required to release the magnets resulted in unacceptable battery life.” 

They claim to have made it faster now but from what I’ve heard through media squid friends, it’s still unnacceptably slow. Not sure why they’re unable to get it to function more promptly.


+1 AJ Barlas
Rob Gretchen  - Feb. 7, 2019, 7:28 a.m.

I have owned the 1st gen Vyron and currently using the 2nd gen on one of my bikes... it is definitely faster than the previous generation but still not where it needs to be IMO.. I can still get along with it OK.    I have had reliability issues though...3 warranty posts, so.... if the new AXS Reverb does all its claimed, other than the too high MSRP it could be a real game changer... and its finally refreshing to see Rockshox add the air bleed feature to this post.   They have adamantly denied that this was an "issue" with their posts, but now at least they have a way to mitigate it without a full teardown...


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