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# Low/High compression threshold

### Tech Articles

Discussion and questions related to the course Suspension Tuning & Optimization

Hi,

Looking through the " how dampers work" video, specifically the part on how 3way adjusters would work, I have a question on the compression side of things. In the provided example (of course, it was discussed that this is just a very generic overview not an actual example), the adjusters for compression work like this:

When adjusting low speed compression, we are changing the slope of the line (i.e. starting from 0 and then just changing the compression at the low/high speed threshold, which changes the slope of the line since it is linear)

When adjusting high speed compression, the slope of the line stays the same, but what we are changing is the compression at the low/high threshold (i.e. we are just moving the line with this slope up and down on the graph)

If I've understood both of those correctly, we are now at my actual question:

Does this mean that, in the theoretical situation where I go to full-hard on my low speed compression and use full-soft on the high speed compression, it would mean that my high speed compression at the low/high threshold would actually be lower than the low speed compression? Or will even the softest high speed compression level always be equal to or higher to the maximum low speed compression?

To be clear, I do understand that the high speed compression will be higher than the low speed compression once we get into higher damper speeds, but this is more to understand the compression behaviour at the threshold where we switch over from low speed to high speed

On a side note, this is an absolutely fantastic course so far! :)

No, the forces due to the high speed asjustment start at whatever the low-speed adjustment reaches at the knee of the curve.

Ok, but then that would mean that when we adjust high speed compression, we would, in fact, be adjusting its slope (just like for low speed), right? If so, the graphic representation of this is a bit confusing in the video :)

The exact behavior depends on the shock design. But yes, generally the slope of the high speed portion of the force curve changes.

See if you can find someone with a Damper Dyno that will let you run your dampers and see the effects of the various changes.

Will be getting my Reiger 3-ways relatively soon, I'll be sure to ask them if they can provide a dyno sheet from my dampers, or will try and do this myself. Thanks for the information! :)