Sag is the most important setting on your bike!
Before you touch a compression dial, before you fiddle with rebound, you need to get one thing right: sag.
Sag sets where in the stroke your suspension operates. It sets your geometry, how the bike tracks the ground, how it corners, and how it absorbs everything from braking bumps to big hits. Get it right and the bike does what the engineers designed it to do. Get it wrong and you're fighting the bike all day, blowing through travel, or riding too high and wondering why the front end won't hold a line.
Proper sag is the single biggest free upgrade you can give any mountain bike.
Watch: setting sag the proper way
The video walks through the complete workflow for measuring sag on any modern mountain bike using the Slacker Digital Sag Scale. Front fork and rear shock, in your normal riding position, with a real digital reading you can repeat every time.
What the video shows
Front fork. Slacker works on mountain bike forks out of the box. The Universal Slacker Mount straps to the lower fork leg, the Universal Fork Adapter straps to the upper tube, Slacker clips onto the mount, and the cable hooks to the adapter. That's it.
Rear shock, standard method. For most bikes, the Virtual Fender Mount handles the rear. It comes with 5mm, 6mm, and 8mm Delrin axle inserts that press fit into the hex key. The 5 and 6mm inserts work on most thru-axles, and the 8mm insert works on most universal derailleur hangers on the drive side.
Rear shock, alternate method. For bikes with toolless axles, or anywhere the inserts won't fit, the Universal Slacker Mount straps to the swingarm. You assemble the three rods, attach the swivel mount and clamp at the base of the seat post, position the sliding loop vertically above the axle, and hook the cable.
The whole point is universal. Whether you're on a high-pivot enduro rig, a short-travel XC bike, or a rental fleet full of mixed brands, the same kit works on every bike.
Built for shops. Trusted by riders.
The video was originally produced for rental shops, which is why it focuses on a fast, repeatable workflow any tech can run on any bike. The same workflow is exactly what serious riders want at home, before a new season, after a suspension service, or anytime the bike doesn't feel quite right.
Ready to dial it in?
Shop Slacker on getslacker.com
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