New Reverb AXS Boasts up to 250MM Drop and New Air Over Air Internals

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SRAM AXS Reverb B1 Review: The Best Wireless Dropper Post for 2025?

The dropper post is one of the most essential tools in any mountain biker’s arsenal, and SRAM just made it better. The all-new SRAM AXS Reverb B1 wireless dropper post is here, and it promises to deliver the smoothest, most intuitive experience yet. With refined wireless actuation, improved reliability, and a robust air-over-air design, this dropper post is set to raise the bar for what we expect from a premium seatpost.

If you're searching for the best dropper post for 2025, here’s why the Reverb AXS B1 is a must-have upgrade for your MTB setup.

Seamless AXS Integration

If you’re already running a SRAM AXS drivetrain, the Reverb AXS B1 wireless dropper post fits in like a dream. The new dropper fully integrates with the AXS ecosystem, meaning you can customize your controller setup to work exactly the way you want. Want to use a single button for shifting and dropping? No problem. Prefer a dedicated dropper lever? That works too. The possibilities are endless, and they’re all adjustable via the SRAM AXS app.

With wireless operation, installation is also as simple as it gets. No cables, no hoses—just a clean and hassle-free setup. If you’re swapping frames or fine-tuning your cockpit, the quick install/removal process will make life a whole lot easier.

Air-Over-Air: A Simpler, More Reliable Design

The biggest tech change with the Reverb AXS B1 is its new air-over-air design. This simplifies the internal system, making it more robust and easier to maintain compared to older hydraulic setups. With fewer moving parts and a modular construction, servicing is straightforward, requiring only standard lubrication every 300 hours of ride time.

More importantly, this design eliminates the squishiness that some riders associate with dropper posts. At full extension, the Reverb AXS B1 is rock-solid, giving you that direct feel you want when climbing or sprinting. Once dropped, the post introduces ActiveRide, a built-in compliance system that provides subtle suspension-like give—especially useful for smoothing out rough terrain and technical climbs.

New Travel Options: 100mm to 250mm in 25mm Increments

SRAM understands that every rider has different needs, so they’re offering the Reverb AXS B1 in a wide range of travel options, from 100mm to 250mm, in 25mm increments. This means you can fine-tune your post length to match your riding style, bike geometry, and personal preference.

Improved battery clearance also means that no matter your frame design, the new Reverb AXS will likely fit better than ever before. If you’ve struggled with dropper fitment in the past, this could be the best dropper post solution you’ve been waiting for.

Rockshox Reverb AXS B1 in 150mm, 175mm, 200mm, and 225mm lengths

Who is the Reverb AXS B1 For?

This dropper is built for GX, X0, and XX riders, meaning whether you’re running a mid-range or top-tier SRAM drivetrain, this post is designed to work seamlessly within your setup. With compatibility for all saddle rail types (7x7, 7x9, and 7x10), it’s also more versatile than ever.

With its robust, easy-to-service design, the Reverb AXS B1 is ideal for riders who want reliability and top-tier performance without the headaches of complex maintenance. Whether you’re an E-MTB rider looking for better climbing control or an enduro racer chasing every marginal gain, this wireless dropper post delivers.

Shredding on the Reverb AXS B1 dropper post

Final Thoughts: Is It Worth It?

SRAM’s latest iteration of the Reverb AXS B1 wireless dropper post is a clear step forward in dropper post technology. The air-over-air system eliminates past reliability concerns, while the ActiveRide compliance introduces an entirely new level of comfort and control. The wireless integration is seamless, installation is easier than ever, and the broad range of travel options ensures a perfect fit for any bike.

If you’re already in the AXS ecosystem, this is a no-brainer. If you’re not, this dropper might just be the excuse you need to make the switch. Either way, the Reverb AXS B1 is setting a new standard for what a dropper post should be.