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I just had one, very brief ride on the Simons.Lab Zeta in my Intend Edge - thought I’d do a VERY brief ride report. I’m 170 lbs, on a Spec Stumpy 15 with CC link 27.5”. I had to up my air pressure quite a bit given the damper leg is no longer sealed. My recommended settings were HSC -4, LSC -4, HSR -4, LSR -9. My Edge steerer is unfortunately really short, so when I removed my Shockcraft Mezzer Stage 2 (which I LOVE), I had to lower my stem 12 mm, so that colors my review a bit...

my post about the charger 2.1 swap somehow disapeard / got deleted (???) but nevermind, thanks for the tip. tossed in a charger 2.1 in the new zeb. feels way smoother AND more supportive. only downside: i can hear the oil squishing. but that's it so far. thanks for your help @Dougal - SC

Welp, we had a good run here at Vital didn't we.

The key difference is where the main restriction actually comes from. With something like the Charger 3, the flow path leading to the shim stack is restricted, so that restriction effectively sits in series with the shim stack. With the ZETA Tune Adjuster, the ports and the fluid paths leading to them are sized so that the shim stack itself remains the main restriction in the flow path. There are always open ports, and the ports themselves are non-restrictive until the flow reaches the shim stack opening. When additional ports are opened, they essentially add another flow path in parallel...

First up, thank you to the Vital team for presenting our product here! Since a few questions came up, I wanted to chime in and clarify a bit what we mean by the Tune Adjusters. As @Slavid666 analyzed pretty much spot-on, the High-Speed Tune Adjuster changes the port configuration underneath a non-preloaded tapered shim stack. With each adjuster position, one additional port is closed off, changing the hydraulically loaded area of the stack. The shim stack itself stays exactly the same, but the way it is loaded changes, which therefore changes the slope of the resulting force-velocity curve. That is...