
2025 ZEB ULTIMATE REVIEW
RockShox’s hard charger is back with a new damper and an upgrade kit for older forks
Words and images: Justin Henehan
RockShox’s hulk-mode single crown fork, the Zeb, has just had its biggest update since it ploughed onto the scene back in 2020. Back for 2025, the overhauled Zeb retains its stiff chassis and recently updated Debonair+ air spring but now has lower friction bushings and a completely retuned damper.
The updated Charger 3.1 RC2 damper has been reworked to offer a more useable range on both the compression and rebound side. At each extreme, the damping is both lighter and heavier, ostensibly catering to a wider range of riders. If you happen to slip outside that bell curve or between settings, custom tunes are available.
Charger 3.1 RC2 damper upgrade programme
Being good buggers, RockShox is also rolling out its new Charger 3.1 RC2 damper upgrade to folk running previous versions of their Zeb, Lyrik or Pike. It’s an upgrade that can be done at any RockShox service centre and will set you back $170 plus labour, which seems like a great way to get your older fork working better than new. Read on to find out if the upgrade is for you.

Charger 3.1 RC2 upgrade kit
Upgrades existing Charger 3 dampers to Charger 3.1
Includes piston assembly, tuning shims, and Head Valve Tool
Compatible with Pike C1+(2023+), Lyrik D1+(2023+), and ZEB A1+(2021+) Charger 3 dampers
High Speed Compression, Low Speed Compression, and Low Speed Rebound adjustments
RRP $170 plus labour
2025 Zeb Ultimate
29-inch (tested) and 27.5-inch versions
Offset: 38mm (27.5″), 44mm (27.5″), 44mm (29″), 51mm (29″)
Axle to crown: 586mm (170mm travel, tested)
38mm stanchions
15x110mm BOOST axle
Debonair+ air spring with Buttercups
Charger 3.1 RC2 damper
Travel range: 150-190mm
Electric Red, Gloss Black, Slab Grey
Weight: 2341g
Price: $2402RRP
Set up
I’ve set up a fair few suspension forks now and the Zeb Ultimate presented a few unexpected wrinkles, mainly because of how off the stock settings felt. The initial set up is not without faff, either.
Going to the RockShox manual, you’ll find an 11-step process that immediately directs you to RockShox’s Trailhead app. Once downloaded, you plug in the fork’s serial number (or product ID) and your weight to give you a starting air-spring pressure and rebound damping setting. The recommended settings for my 80kg dadbod were 60psi in the air spring and 10 clicks from closed on the rebound damping.
Back to the manual, and it’s a process of gradually airing and cycling the fork to balance the positive and negative air springs. Once that’s sorted, it’s onto compression damping.
With the newer Charger 3.1 dampers, everyone is prompted to start in the middle of the compression range, regardless of weight or riding style. I was skeptical.
RockShox stresses that these settings are just a starting point, and they have a handy illustrated guide showing what the compression damping adjusters do to help get things dialled.
Stock settings in place, the Zeb felt very eager to use its travel while bouncing around and practicing stoppies down the steep streets of Brooklyn. I could even pull the lowers out a few millimetres from the fork’s un-sagged position. Measuring the exposed stanchion from the top of the wiper seal to the line marked “full travel” showed that my 170mm fork actually had more like 165-167mm of travel.
I repeated the set-up process to make sure I hadn’t done anything wrong and ended up with the same result.
I’m more concerned with how my fork is using its travel rather than whether it’s hitting a particular travel number, so I wasn’t too worried about this, but it’s an interesting data point.
Bracketing and riding
My first run on the new Zeb was down Makara Peak’s Ridgeline, a flattish, grade-5 track that’s littered with a jumble of small- to medium-sized rocks, a small drop, a couple of steeper bits, and some tight, sequential berms. It’s a trail that likes to unsettle rider and bike if your suspension is not set up properly, but it feels magic when you’re up to speed and everything’s dialled.
During that first run I felt like I was riding off the back too much and the fork was diving through the middle part of the travel. Adding more compression damping over a couple more runs helped, but I still wanted more support and I was running out of clicks.
The best option was to increase the air pressure and to make the spring more linear by removing the single, stock volume-reducing token. The aim was to boost the dynamic ride height and increase mid-stroke support by flattening out the spring curve. This should also help improve damping consistency making it easier to get the damper dialled.
After a couple more bracketing runs, I settled on 0 tokens, 67psi, HSC at plus two clicks from middle, LSC at plus four clicks from middle, and the rebound damping at eight clicks from closed.
Set up sorted, I could now really get a feel for what the fork was doing on a range of different trails. I should preface this by saying that I don’t think the “best and worst” or “good and bad” binaries are very useful—there are big differences in feel between suspension forks, from chassis, to spring, to damper, and what’s right for you may not work well for someone else.
As a point of comparison, the EXT Era is roughly aimed at the same type of rider as the Zeb, but it couldn’t feel more different on the trail. Some people like the EXT feel, some prefer RockShox. Neither is bad, they just have different traits and characteristics. The key is knowing what traits and characteristics work for you.
The defining trait of the Zeb is still its chassis stiffness—it might be the most torsionally-stiff single crown fork on the market today. That lack of twist creates a very direct steering feel, translating your every move into instant and precise direction changes. The Zeb is very good at resisting understeer and keeping the wheel pointing where you want. Heavier riders will enjoy the lack of twist as their weight swings through the bottom bracket in corners. Similarly, the Zeb’s stiffness will work well on heavier, full-power e-bikes.
The downside of that torsional stiffness can be felt in slower, more technical trails, where low-momentum, angled impacts that aren’t absorbed by the spring and damper will be felt more at the bars. If you ride a lot of these type of trails, a more compliant fork like the RockShox Lyrik might be a better choice.

Once used to the feel of the Zeb, I really started to jell with it. It’s a burly fork that needs to be ridden hard and feels best when smashing into stuff at pace. It felt especially good when ploughing into deep and heavy G-outs, like the filter feature at the start of Makara Peak’s Trickle Falls or the rocky chute on Live Wires. In these instances, the Zeb recovered quickly without any hint of deflection, keeping things composed for the tight corners at the bottom.
The Zeb was also dead quiet, among the quietest suspension products I’ve experienced—you won’t hear a peep from the new Charger 3.1 damper regardless of how hard you push it. On top of the silence, the damper feels light and unobtrusive, a stark contrast to the more hydraulic-feel of forks like the EXT Era and the Ohlins RFX38 m.2, which make much more use of compression damping for support.
RockShox has done a great job of dialling in the range of damping on offer and the transition between high and low speed compression circuits seems massively improved over previous versions.
Those who like to run their rebound damping very fast will enjoy the extra return speed on tap with the Charger 3.1 too.
“The Zeb Ultimate is the strong silent type, the burly, ball-carrying loose forward who batters the defensive line…”

Who’s it for
The Zeb Ultimate is the strong silent type, the burly, ball-carrying loose forward who batters the defensive line, dives into every ruck, delivers bone-crunching tackle after tackle, and plays the full 80 without complaint.
While I don’t see much value in frothy proclamations of “best fork”, the Zeb Ultimate will be exactly that for some riders. The defining trait of the Zeb is still its torsionally-stiff chassis, which hard-chargers, park riders, heavier folk, and e-bike enthusiasts will love. If you like a very responsive and direct-feeling front end, the Zeb would be a good match for you.
The new Charger 3.1 RC2 damper performed much better than its predecessors across a range of different settings, providing a quiet and unobtrusive feel without any weird spiking. Its light touch and quick recovery will suit riders who like a very active front end.
Charger 3.1 RC2 damper upgrade programme
If you have an older Charger damper, I’d recommend getting in touch with your local service centre about RockShox’s $170 damper-upgrade programme. It’s a worthy upgrade for not much cash that’ll have your older fork working better than new.
2025 RockShox Zeb Ultimate: RRP NZ$2402
Charger 3.1 RC2 damper upgrade: NZ$170 plus labour