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RockShox Reverb Seatpost

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Item # RSX0042

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Item # RSX0042


Perfect saddle height—instantly.

Adjustable seatposts have quickly become the norm for all-mountain and freeride mountain bikes. When the first mechanically operated posts started to appear on long-travel bikes, they were heavy and finicky (the HiteRite aside, of course). However, advantages far outweighed disadvantages and their popularity quickly grew. adjustable seatposts have come a long way since then, and now products like the RockShox Reverb 125mm take advantage of extensive suspension technology to offer smooth, slop-free operation.

By opting for a hydraulic actuation of a cable, the Reverb is the first post to eliminate any mechanical connection. Hydraulics may be cause for alarm, but if you're running disc brakes they're more than likely hydraulic -- and share the same, basic principles. Expect the Reverb to be as reliable and easy-to-service as any modern hydraulic disc brake. RockShox is so sure of hydraulics that they use it to operate their remote fork lock-outs too. In fact, both the Reverb and RockShox suspension lock-out systems use a bar-mounted XLoc remote.

This system uses 2.5-weight fork oil, and comes with the necessary materials and instructions to shorten and bleed the line. It won't become contaminated with grit like cables, and it's also lighter than a comparable cable-actuated unit. Fluid in the line opens and closes the Reverb's main oil-flow valve, allowing the post to drop, and the aluminum knob at the lever controls how fast the post returns to its static position. The post has 125mm of travel, and its height is infinitely adjustable.

RockShox has an advantage over other dropper post designs due to its extensive suspension technologies. For example, the seals used are optimized to prevent contamination from dirt and water, and, just like fork seals, they're free from friction out of the box. You'll also find an IFP, an internal floating piston, which is another shared technology from RockShox's forks and shocks. The IFP prevents the oil from mixing with the air preload and offers a buffer if your buddy decides to lift the saddle up without pressing the XLoc button.

Both the post shaft and head are constructed out of forged 7050 aluminum and they're anodized for durability. Longer-than-average clamps support the saddle rails, which simplifies saddle fore and aft adjustment, as well as tilt, by making the two bolts easy to access. Markings on the head and clamp also assist with fine tuning.

The XLoc remote is compatible with MatchMaker X mounts to allow integration with brake lever and shifter clamps for a clean cockpit. The XLoc is available in left and right configurations, to further enhance ergonomics. The Reverb comes in two diameters, 31.6 and 30.9, and two lengths, 420mm and 380mm. It has zero offset.

  • Adjustable return speed at the handlebar remote
  • Triple-lipped seal system for long maintenance intervals
  • Easy-to-use two-bolt clamping system

Tech Specs

31.6 mm 30.9 mm
420 mm 380 mm
Drop Range:
125 mm
Claimed Weight:
558 g
Recommended Use:
all mountain, free ride
Manufacturer Warranty:
2 years

Reviews & Community

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Here's what others have to say...

4 5

Best clamp? No. Best Control? Yes.

  • Familiarity: I've put it through the wringer

As a longtime Thompson devotee, I want to like the Thompson Dropper, but the hydraulic control on the Reverb simply feels the best to me. Get a thumb on it, and you can make fine adjustments to saddle height on a rough descent more easily than on any of the cable actuated posts. My only beef with the Reverb is the way the saddle clamp develops some creaking over time. A little lube or grease on rails and bolts seems to keep things a little quieter.

4 5

Gets the job done with ease

  • Familiarity: I've put it through the wringer

I opted for the Reverb due to its fully hydraulic actuation and to this day am still happy with my decision. The ease of use with the light actuation button (mounted on the underside of my bar on the left) is incomparable to competitors. After 3-5 rides I found myself instinctively using the post with little thought of preparation by either slowing down or glancing at the lever.

The post has been on my bike for 3-4 months now with no issues that weren't solved with general maintenance (aka refill the air chamber to the required PSI). When the air pressure dropped enough below the required height, the saddle would sag through the stroke, but thankfully this was solved within seconds. One thing I would like to point out is seat clamp torque. If this is over tightened there is a good chance the post will not drop or will hang up on release.

That being said, I haven't encountered any of the previous generation issues and am finally convinced a dropper post is a must have for any trail rider out there due to the immense increased to on trail fun.

Will this fit on my GIANT 29er Alloy Fully...

Will this fit on my GIANT 29er Alloy Fully Anthem?

Responded on

According to the Giant website they use the Giant Connect SL, 30.9 on this years model. If your model is this years it should match, but I would verify this. Right now backcountry has the 30.9mm model

How do I choose the size? My current seat...

How do I choose the size? My current seat post says 34.9 and 400mm. Thanks

Responded on

You need to match the seatpost diameter spec. The length doesn't need to be matched unless you absolutely need the full 400mm