Staff Bike Checks | Mike's Specialized Stumpjumper EVO S-Works

specialized stumpjumper evo s-works custom mountain bike build with rockshox suspension and sram transmission

The Stumpjumper EVO is an incredibly popular bike for riders that put themselves in the aggressive-trail or enduro categories. The adjustable frame geometry and mass availability makes it easy for any rider to take one home and fine tune it to their specific needs. That being said, I found myself encountering a common trend with people contacting us with questions specifically about compatibility and recommendations for aftermarket upgrades on their Stumpjumper EVO’s. And as the owner of a bike shop that specializes on aftermarket upgrades for trail and enduro bikes, I figured it would be great to hop on a Stumpy EVO myself to better help our customers. I also used this opportunity to try out some new parts that I had not yet experienced on the trails.

To start the build, I needed a frame, and ended up choosing the S-Works model. Why? Not because S-Works equals better, but simply because it was the only black frame they had. Since we commonly test out many components in different colors, I really like having a black frame as a foundation for my bikes. Also, I wanted to focus on saving weight throughout this entire build, and it doesn’t hurt that the S-Works model sheds a few grams. My last few bikes have had no real emphasis on saving weight, but rather be built for durability.

Frame: Specialized Stumpjumper EVO S-Works,


Fork: RockShox Lyrik Ultimate - 160mm

Shock: RockShox Super Deluxe Ultimate

Crankset: SRAM X0 Eagle AXS

Chainring: SRAM X0 Eagle AXS

Derailleur: SRAM X0 Eagle AXS

Shifter: SRAM Eagle AXS Pod

Chain: SRAM X0 Eagle AXS

Cassette: SRAM X0 Eagle AXS 10-52t

Pedals: Race Face Atlas

Hubs: Industry Nine Hydra

Rims: Evil Loophole

Tires: Maxxis DHR, EXO / Maxxis Dissector EXO+

Saddle: Specialized Power Expert Mimic

Seatpost: OneUp Components Dropper V2 -


Dropper Lever: OneUp Dropper Post Remote

Bars: OneUp Components Carbon Handlebar

Stem: Race Face Turbine R

Grips: ODI Elite Pro

Brakes: TRP DH-R Evo

Rotors: TRP R1 - 220mm

I wanted this bike to be a little different - to be as lightweight and durable as possible for long days in the saddle to test out the durability of individual components that are on the “lighter-duty” side of things.

For handling rolling duties, I chose some Evil Loophole wheels laced to Industry Nine Hydra hubs. The Loophole rims are a fusion-fiber design, which is comparable to carbon fiber. The Industry Nine Hydra hubs are undeniably popular for their sound, engagement and reliability. I chose to run 29” wheels front and rear since my previous bike was set up as mullet and I wanted to try something different. I was hoping that the dual 29” wheels would roll a little faster on the climbs and descents. Plus, I wanted a fresh perspective on a full 29” setup because it’s been a couple years since I have ridden with a big wheel out back. Wrapped around the pseudo-carbon rims is a set of Maxxis tires. While I’ve ridden the Assegai up front since its release, I wanted to revert back to the classic Minion DHF to see how it compares, but I did stick with my current favorite rear tire, the Dissector. I’ve been using EXO+ front and DoubleDown rear casings for a couple of years, so I also wanted to test how a more lightweight EXO front and EXO+ rear would hold up to trail abuse on this new bike.

sram transmission on a specialized stumpjumper evo
sram transmission pod control on oneup components carbon handlebar

To get the bike physically moving under my own power, I chose the newest SRAM X0 Transmission groupset. I was very excited to test out the increased shifting performance under load. I chose XX over X0 simply due to the carbon cranks saving about one third of a pound. I’ve had an excellent history with the durability of SRAM carbon cranks, so the weight savings were a no-brainer for me. Next to the handlebar mounted SRAM AXS Shifter Pod are a set of TRP DH-R EVO brake levers, and their calipers are contacting TRP R1 220mm rotors front and rear. I’ve been a mega fan of SRAM Code RSC brakes for years, but I’ve heard great things about some alternative brakes like these TRPs, Hayes Dominions, Magura MT7s, and Magura MT5s, so I figured I should probably start trying some new options. Honestly, I would have chosen a 203mm rotor front and rear, but we had this set of big rotors sitting around to test so I figured “why not”. These rotors are pretty heavy, and I will likely switch to the TRP-42 in 203mm on both ends if I do decide to stick with these TRP brakes long-term.

trp dh-r evo mountain bike brakes on oneup components carbon handlebars
trp dh-r evo caliper on a rockshox lyrik ultimate with buttercups

When it came to the task of picking suspension front and rear, I had these in my mind for weeks. I chose to run the RockShox Lyrik Ultimate in 160mm and the RockShox Super Deluxe Ultimate.

I think the Lyrik is about as “perfect” as you can get for a trail fork, and the Super Deluxe is hardly different. I got lucky and didn’t end up with an off the shelf shock. I was able to reach out to RockShox and get my hands on one that was tuned specifically for the Stumpjumper EVO which also includes the HBO (hydraulic bottom out) feature as seen on the coil version of aftermarket Super Deluxe Ultimate shocks. You can’t purchase one of these in the aftermarket yet, but I’m really hoping that RockShox will release these as an aftermarket option soon. The frame actually came with a Factory Fox Float X rear shock with the “Rx Tune” as Specialized calls it, which is no slouch of a shock.

2023 rockshox lyrik ultimate with charger3 damper with buttercups

I chose to replace it with the Super Deluxe for two reasons. First, I just really like the overall feel of current RockShox suspension. ButterCups and the Charger3 Dampers are tought to beat. I’ve found the adjustments to be simple yet functional, and the overall feeling is buttery smooth and predictable. Second, I wanted a chance to compare these shocks back-to-back since they are such direct rivals, and our customers frequently ask me about how they compare on the trail.

rockshox super deluxe ultimate on a specialized stumpjumper evo custom mountain bike

Buttoning up the build, I stuck with a few of my favorite components. The OneUp Dropper V2 has super short insertion depth, and I’m easily able to run a 180mm dropper post in my S3 frame size. The OneUp Carbon Handlebars are also ridiculously comfortable on the trail, and provide a very sleek appearance to my cockpit. Holding those bars is a Race Face Turbine R stem which I’ve been a fan of for years due to its low weight and streamlined design. I chose to run a 40mm length stem with my S3 frame as I felt that would be a good starting point since I wasn’t exactly sure how short or long I wanted the bike’s reach to feel. It wouldn’t be a “Mike bike” without black ODI Elite Pro Grips to round out the cockpit. Besides the Turbine R stem, I also featured RaceFace components in one other area of the build - RaceFace Atlas Pedals. These came off of my other bike and I wanted to continue testing their durability and grip.

Last “butt” not least, I chose a Specialized Power Expert Mimic Saddle with titanium rails. My previous saddle, a Chromag Trailmaster DT, just never got along with my skeleton and caused some numbing on long climbs. I’ve heard excellent things about the current lineup of Specialized saddles, so I figured I would give it a try. So far, so good - no numbing or discomfort.

The bike ended up weighing in at just under 31 pounds, which can definitely be considered lightweight in the sea of 37 pound enduro bikes we often see these days. I was super excited to hit the trails with this new build, and did so almost immediately after tighteing the last bolt. I did my basic suspension and tire pressure setup at the shop and, to no surprise, everything felt nearly perfect on the first ride. I’m not sure how the engineers at RockShox do it, but their recommended settings are nearly 100% spot on for me with their forks and shocks. With the little bit of fine tuning I chose to do on the fork and shock, the current Lyrik and Super Deluxe Ultimate offer a very simple set of click configurations which are easy to set. I’ve also only needed to make small adjustments to the saddle height and stem spacers to dial in my setup.

Overall I am super happy with the bike’s fit and feel - the whole tone is “supportive." I feel cradled at high speeds due to the frame’s suspension design and geometry. I have the frame set up in the neutral headset position and the low bottom bracket height. As of now, I don’t see that changing as a 64 degree headtube angle is really a happy medium for me when it comes to being aggressive, but not too aggressive. And the low bottom bracket height being at 333mm is definitely very low, but so far I have absolutely zero issues with pedal strikes. However, I can definitely tell that this low bottom bracket height makes this bike seriously rip through corners, and I honestly can’t believe how insanely well this bike corners at high speeds. And to be intentionally cliché, it does climb like a mountain goat with lots of traction and a lack of trail bob. I’ve never personally ridden a mountain goat, however, so this is just speculation.

My Stumpy EVO build is pretty light without sacrificing much in durability, it corners insanely well, it’s super supportive through high speed chatter, and climbs more than well enough for me. I look forward to beating this bike into the ground, testing out the platform, and testing out new components. I also can’t wait to feel more confident in giving more precise recommendations to our large customer base who ride the Stumpjumper EVO platform themselves. It’s too early to give a true in-depth review on the overall bike and new-to-me components, but keep an eye on our blog as I will likely be writing lots of reviews and comparisons with this new build.

    That’s about it for now! If you’re interested in picking up any of these parts, we carry everything that I’ve mentioned here at The Lost Co.

Check out the website or give us a call if you have any questions!

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Mike Randol



Bellingham, WA

Current Bikes: Specialized Stumpjumper EVO S-Works Custom Build, Mullet Devinci Spartan Custom Build

Bike Size: S3/Medium

Favorite Trails: Dirt Merchant in Whistler, Chuckanut Mountain Trails in Bellingham

About Me: I grew up hucking my bike off curbs in the suburbs of Chicago. I moved out to the PNW in 2014 and opened The Lost Co in 2016. I freaking love riding long rough descents and really pushing my body to the limit. I'll straight up ride any type of bike but really prefer long travel 27.5" bikes. However, mid-travel 29r's are growing on me...