The Shock Lab
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Service/Repair/Upgrade for your mountain bike suspension
05/16/2026
Adjustable Bottom Out bumper? 🤔
The latest Rockshox ZEB and Lyrik (and soon Pike?) feature a non-hydraulic Adjustable Bottom Out (which is why it's been renamed to ABO across all products) 🤘
Teased (likely by mistake) in the webinar/training for the Boxxer release earlier this year, I remember they mentioned the bottom out bumper was adjustable, which I found hard to believe, specially considering the Buttercups are in the way!
But...they made it happen 🔥
So, here's how it works:
The hex adjuster runs through the middle of the buttercup bumpers and rotates the upper gold sleeve (and the air spring shaft with it) to screw it up or down the lower gold sleeve. Both of which are quite mesmerizing 🤤
The bottom out bumper rests against the upper gold sleeve and is pushed up with it when adjusted. It is not pulled back down but it will move back into place the next time you use full travel, of course 🤙
It's worth noting that this does not change your travel. There is still a "traditional" bumper/stopper in the damper side, which is what actually determines where the fork will stop. The adjustable bumper will just engage a bit earlier/later in the stroke and provide more/less resistance to bottom out 🤘
You may have noticed the sealhead looks a bit weird, like it's missing a wiper seal (well, it is), but this groove is actually brilliant, designed to prevent the bumper from ramming oil through the seal head and into the air spring 🔍
The Buttercup bumper is also a bit taller than before, and relatively stiff, so the Buttercup effect 🦋 is very slight but noticeable. Helping "take the edge off" impacts, a similar feel to a 5-10% drop in tire pressure, without the risk of pinch flats, of course 🤌
One small thing; although maybe not totally necessary, and I understand Rockshox usually tries to keep the number of specialty tools low (which I support), but I made a custom bullet tool to eliminate the chance of the quad ring catching on the sharp edge (slide6) 🤘
How does it ride? 🤔
It is amazingly smooth off the top, quite supportive through the midstroke, and allows you to use all the travel efficiently, I'm VERY happy with it after upgrading the damper 🔥
Service yourself without spending a fortune! 🔧
Our affordable tool collection keeps growing, now allowing you to fully service your fork without spending hundreds of dollars in specialty tools that may be used once a year! 💸
Featuring our new angled shaft clamps for GRIP/GRIP2/GRIP X2 (22.6/10mm), these are just $10!
But, why angled? 🤔
The slight angle allows you to clamp closer to the center of the vise, minimizing uneven clamping forces. This also allows to clamp larger tubes without having half the clamp sticking out the vise! Also available in 38 and 40mm to clamp DH fork stanchions (more sizes coming soon!) 🤘
You may have also noticed our new carbon-reinforced NA2 socket. These make the process much easier and quicker (but they're not necessary), and can easily take the 50in/lb torque repeatedly (rated to 100+in/lb to failure at room temp) 🤙
Also (not shown in the video), you can get our 1x12" Delrin rod for removing wiper seals ($10). As well as our wiper seal drivers ($15) 🔥
Please consider that you'll also need common shop tools/equipment, such as torque wrench, sockets, crowfoot wrench (adjustable recommended!), hex keys...etc. AND keep in mind the service is a complex and delicate process that can be screwed up relatively easily. So, take it seriously, study the service manual and save that beer for after you're done! 🍻
Affordable tools, premium seals, and custom service. Link in bio 🔗
A revolution in end stroke support is coming 🔥
Even the most advanced MTB bumpers are currently a "solid" piece of rubber, foam or polyurethane. Injection molded or machined to shape, giving them a uniform density throughout, which might just be their biggest limitation 👀
What if, besides external geometry and compound hardness, you could independently tune top/bottom shells, walls, infill density (and dozens of other parameters) to optimize the bumper's characteristics in every part of their stroke? 🤔
It has taken months of designs, tests and tweaks in the middle of the night (to avoid delaying workorders), and there's still a lot to be done to optimize all the variants , but the possibilities are truly endless and the results so far are beyond amazing 🤯
Some of these are currently being tested by local riders (and myself), and very few variants are already available as Beta upgrades with your service! 🤘
The best part? They can be "quickly" designed, sized and tuned for each application! There is no need for custom molds for every variant, allowing for optimized heights and spring rate for different riders, besides, we can make virtually any size/shape you need for unusual/custom projects! 🤙
The future of MTB bumpers is here.
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