Slacker V4 MTB Bundle


 All New- Now works with any style axles!

The new Slacker V4 MTB bundle allows you to use Slacker on e-bikes and mountain bikes using our new Universal Slacker Mount.

Simply strap the mount on the frame or fork and stick Slacker to the steel mounting disc. The seat rail loop simply clips on the seat rail to provide or a place to hook the retractable cable. This new system is much faster and more reliable than the old axle inserts and allows you to use the tool on tool-less axles.

With our Service Assistant app, you can see all of your measurements and travel percentage displayed in real-time on your Bluetooth® enabled Apple® or Android® smartphone or tablet. You can also save settings directly to your profile so it is easy to remember what you did, and when you did it:)

Includes- 1) Complete Slacker V4 package plus-
1) Universal Mount, 2) Seat Rail Loops, 1) 12" Cinch Strap, 1) 8" Cinch Strap

User Guide

The new Slacker V4 with Bluetooth® is the ultimate suspension tool for all your bikes. Building off the proven record of the Slacker V3, he V4 is so much more than a sag scale that we are re-branding it as the Slacker Digital Suspension Tuner in recognition of all it's new capabilities.


The new Slacker V4 Digital Suspension Tuner with Bluetooth® takes suspension tuning to a whole new level. Now you can use your Apple® or Android® device as a virtual remote display and save settings directly to your profile in our free Service Assistant App. You can also add a dedicated wireless remote display if you want to keep it simple. The V4 builds on the first 3 generations of Slackers and brings all the reliability and and precision you have come to expect.


The new Slacker Virtual Remote (shown here with optional smartphone bar mount) is now included with our Service Assistant app for iOS and Android. Now you can use your phone as a remote display, and save measurements directly to your setup notes. The virtual remote also allows you to reset Slacker to zero and place it in Auto Zero mode from your phone. Manage multiple Slackers securely in the cloud.

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The optional Slacker V4 Wireless Remote extends Slacker's primary display and button functions so you can always have a remote, regardless of whether you have your phone or not. It can be used in tandem with the Virtual remote for simultaneous, multiple display options or as a dedicated remote for those who just want the basics.

Cut the O-Ring!

Slacker is perfect for setting up air or spring shocks and forks. This tool makes it super simple for anyone to quickly take real-time measurements and make adjustments with absolutely no assistance. Checking suspension sag and health regularly and adjusting it for different riding conditions is key to getting the most out of your bikes suspension and assuring the bike is predictable and safe! It is super easy to adjust and you will kick yourself for not doing it as a regular part of your usual bike setup sooner.

Fast, Simple, Precise-

Slacker is a patented system that allows anyone to quickly and easily setup their bike’s suspension. Measuring sag at the shock is horribly inaccurate and does not allow for fine adjustments. In fact, if you set your bike up once using an o-ring on the shock and then set it up again you will be hard pressed to be anywhere near the original setting. Slacker can show you exactly how much sag you have in real-time so you can bounce the bike and settle the suspension confidently.The tool was developed over the course of two years with input from industry leading suspension companies like Factory Connection and Pro Circuit to assure the accuracy, consistency and reliability of the tool.Slacker has become the standard in off-road, street and adventure bike setup and is now available for MTB.

Includes: 1) Slacker V4 digital suspension tuner and 1) MTB Hex Key Axle insert for downhill and XC mountain bikes. -Wireless remote and smartphone bar mount sold separately. (5mm, 6mm and 8mm Hex Key Inserts are also available individually)

-Requires thru axles with hex keys to work with our MTB axle inserts. 5mm, 6mm or 8mm hex insert and universal fork/seat post adapter are included in this bundle.

-All measurements are shown in real-time on main unit and remote display.
-Far more precise measurements than measuring at the shock.
-Much finer adjustments are possible to get the perfect setup.
-Allows you to bounce the bike to settle the suspension unlike an o-ring.

Measurements are based on the total travel measured in reference to Slacker's positioning on the bike and directly reflects the percentage of travel used at the shock. It is far more accurate and repeatable than measuring at the shock body.

2-Year Limited Warranty-We will repair or replace your Slacker if you have any issues due to the manufacturing defects or material quality. We just require proof of purchase to verify purchase date.

30-day Money Back Guarantee! If your bike doesn't handle better than ever you can return Slacker with no questions asked within 30 days from when it arrives.