Gear

Review: RockShox Reverb 100mm dropper seatpost

In a word: flawless

Reverb 100
The Reverb now comes in a 100mm option. Photo: Caley Fretz © Singletrack.com

Telescopic seatposts are quickly becoming a must-have for trail riders, and for good reason. There is no question that a lower saddle keeps the flow flowing when the going gets gnarly, but stopping to manually adjust saddle height at the top of every hill is absurd. Dropping posts are the answer.

RockShox entered the market last year with the original Reverb, offering 125mm of saddle movement in a 380 or 420mm length. This year, they’re adding a 100mm option for those looking for a bit less travel (or riding a shorter travel, less aggressive bike), in 355 or 420mm lengths. At $300 the Reverb is far from cheap, but few upgrades will do more for your mid-ride grin tally.

Reverb 100
The Reverb's hydraulic line is nicely routed on this BMC TrailFox, but on a frame that isn't designed for a dropper post things could get a little messy. Photo: Caley Fretz © Singletrack.com

Besides the addition of the 100mm option, RockShox made a few small but important changes to the Reverb. Most importantly, the old plastic line is gone, replaced with a true hydraulic line. The plastic line was identical to the ones RockShox uses for their forks, and simply was not capable of spanning the longer distance from bars to saddle without issues. The old barbed fitting would break off, sending suspension oil everywhere. The little OxyClean spray bottles gets suspension oil out of clothing surprisingly well, by the way (found that one out after an old Reverb explosion). The new design solves this problem with a thread-in fitting at the remote.

This year, the post will ship with a nifty little collar that can be mounted on the post to limit its travel. With the 100mm version tested here, we never felt any inclination to use it, but for someone looking for just a bit of drop it could come in handy.

Reverb 100
The Reverb uses a hydraulic remote. Photo: Caley Fretz © Singletrack.com

Mounting the Reverb up to a BMC TrailFox TF01, which comes stock with a 125mm Reverb and has purpose-built cable guides for the line, was as easy as it gets. Mount the remote to the X.0 shifters, put the seatpost in, and run line through the guides. Simple.

The post’s movement is controlled through a combination of oil and air. An air valve adorns the inside of the post. Put in 250psi and forget about it. Unlike other oil-driven posts, the Reverb’s hydraulic remote means no more futzing with cables running from bar to the post itself.

The seals that keep all that technology clean are impressive: triple lipped with a foam ring. They are definitely better than many forks.

Bleeding is no problem, much easier than a set of brakes. RockShox includes a bleed kit, including the 2.5wt suspension oil used instead of hydraulic fluid.

The Reverb has to function as a regular seatpost, too, so it’s nice that RockShox has gone with a simple two-bolt clamp design. It’s very secure and swapping saddles isn’t any more maddening than a standard post.


In a word: flawless. I can’t really find anything functionally wrong with it.

Just like the 125mm version, the 100mm Reverb has zero play both extended and compressed, so there’s no annoying saddle rocking or creaking noises. Push the remote, give the saddle a quick butt-tap and the post drops right down. Push it again and it pops back up, at a rate controlled by twisting a dial on the remote.

The 100mm option is a bit shorter than I like on a trail bike, but is perfect for a less aggressive rig or rider.

The only two downsides are weight —538g for this 355mm long version, heavier for a longer post — and where to run the remote line if your bike isn’t set up for it. Creative zip-tie work is really your only option, and that can be a bit unsightly. Just cover it all in mud and nobody will ever know.

Even so, I’m planning on running this shorter 100mm version on my full suspension XC rig next year, and the 125 is on every trail bike I ride. The time gained on the long descents here in Colorado is worth half a pound on the climbs for me.