Words Lester Perry
Images Thomas Falconer
RRP $2975
Distributor Shimano NZ
There’s a fresh, new (and much-welcomed) dropper post in the RockShox range. The latest Reverb B1 broke cover recently, and I’ve been putting in some rides to get familiar with it. Here’s the lowdown after a month or so.
Firstly, somehow, unlike almost everything in life at the moment, the price of this new Reverb is actually less than the previous. Given its comparable simplicity, it’s also likely to save you money in the long run over that model, too. Go figure.
As with the Previous Reverb AXS post, there are no cables or wires involved. The Reverb B1 seamlessly slots into the AXS ecosystem. Simply drop the post into the bike, pair it up to an AXS controller, and you’re good to go. If you’re running an AXS drive train, it’s nice to be able to fine-tune which button on your cockpit activates the post through the SRAM AXS app; there are numerous combinations, although some make more sense than others.
From first glance, it appears the most significant change on the post is the moving of the actuator and battery from the head of the post down to its collar. This change, combined with a redesigned seat clamp, reduces the stack height by a fraction from the previous post. Most importantly, it brings the weight more centrally on the bike. The stack height is still above the market-leading One Up V3 post, although that’s cable-actuated, so not an accurate apples-to-apples comparison. Can’t have it all, I guess. The overall length of the post is shorter than previous Reverbs, though, bringing it closer to the competition so riders can now have more drop on smaller bikes.
There are seven drops available, ranging from 100mm to a gargantuan 250mm, stepping up in 25mm increments. From what I can find, 250mm is the largest in the market by 10mm. Previously, some head scratching, measuring, and diagram drawing (true story) would ensue as I tried to figure out what the longest drop I could fit on my bike would be in relation to my preferred saddle height; thankfully, RockShox has a handy calculator on their website to help determine the best option for any frame.
With the noticeable external changes, it would be easy to miss the other significant change in the post. A new ‘air over air’ design ditches the previous hydraulics in favour of positive and negative air springs. The two air springs balance pressure against each other as the post drops, effectively supporting rider weight on the positive air spring rather than relying on the hydraulics of the past. It’s no secret that RockShox’s previous posts had issues when their air and oil mixed, leaving a flaccid, squishy post in need of an expensive service. Long term, it remains to be seen, but if this system lives up to the hype, the days of unintended squish appear to be over.
The new air-over-air spring enabled a new feature, ActiveRide, which provides a small amount of vertical movement. At full extension, the amount of pressure in the post indicates the amount of travel available when fully extended. At the maximum pressure of 600psi (425psi on the 34.9mm post), it’s rock solid at the top of the stroke; the deeper into its stroke, the more travel or squish is available. It’s not a lot, but it’s there, and it increases if you drop the pressure in the post. Why build what is effectively suspension travel in the post? RockShox theory suggests that at full height, it enables a rider to stay fully weighted on the saddle over rougher terrain, which is particularly beneficial while climbing, as the rider can continue to apply consistent power without needing to disrupt their rhythm by unweighting. When tackling a particularly technical climb with steps or moves where dropping the saddle slightly is advantageous, the travel in the post again allows some damping against the terrain, helping you stay seated for longer. The conspiracist in me thinks that maybe, just maybe, RockShox couldn’t get the post to be rock solid when partially compressed with this new air spring, so they embraced the squish and gave it a name. Whatever the case, it seems to do what they claim, although I’m not so sure there’s a performance advantage on anything other than a hardtail.
The AXS button is now easier to reach while in the saddle, located at the top of the actuator (by the battery). It’s used to sync the post with its controller or as a manual actuator should a controller go offline. The post works with any actuator in the AXS ecosystem, including older paddle-style controllers and the now- common double-button pod controller.
With a claimed 60 hours of use from a full charge, or over 20 weeks for most of us regular folks, the battery will last a long time, but it’s easy to forget about it, too. If you’re running other AXS components, you’ll likely have the same battery elsewhere, so swapping a derailleur battery to a post, or vice versa, could be a saviour. I’ve seen this swap done on more than one race start line when a rider realised their derailleur was nearing flat.
Servicing on previous Reverbs was a total headache, and if an issue resulted in a complete rebuild, it was often cheaper to just replace the post with one other than a Reverb. This simpler design, combined with some forethought from the product team, means the B1 is completely user-serviceable. A simple ‘clean and grease’ 1-year service can be completed in literally minutes and requires only a few standard tools. No seal kits or oil faff required. The 2-year (600-hour) service is a bit more involved and requires some more specialist tools, but is still achievable for a competent home mechanic, thanks in part to SRAM’s in-depth online service manuals and YouTube tutorials.
Riding the new Reverb is not unlike the old version: push the button while you’re sitting on the saddle, and the post drops. Stand up, press the button, and the post shoots back to full extension. I’ve found myself reaching down at times to feel if the ActiveRide is doing anything, and sure enough, it’s going up and down slightly as I ride over bumps, although it’s hard to say if it’s offering any sort of advantage. There’s no rotational slop at all in the post and, so far, no sign of forward and backward movement either.
It’s nice to see RockShox are not resting on their laurels with their previous post, but recognising there were some shortcomings and developing something new in the form of the B1. They should get extra points for a complete revision rather than just minor updates. While it would be nice to see some fine-tuning of the drop available, like many mechanical posts, I guess that leaves something for RockShox to strive for in their next release. Maybe?
Given how simple the post is to install, and its price tag, it’s likely the post could be passed from bike to bike as its owner updates or changes their frame. However, with how new the post is to the market, it’s only fair to mention that no one’s 100% sure of its lifespan.
