Let’s Welcome Ohlins USA

Jhill

I think you have this backwards. Typically a 1 adjuster is the low speed rebound is the major change and you may see a slight change in compression but it is minimal at best (some even put in a one way valve to ensure there is no crosstalk). For some reason the car world continues to call it a soft-firm adjuster when in reality is should be a slow-fast adjuster, if you have non true type coilovers just pull your rear shock and test it yourself and you’ll find the difference in effort to compress the shock at full soft is essentially unnoticeable vs firm yet the difference the shock returns will be instantly apparent. The reason behind this is rebound ports are smaller than compression ports as the rebound actually needs to be more restrictive than compression (may sound odd but look at any damper piston and the smaller ports are the rebound). That said the single adjuster adjust the size of the free bleed port and since that port cannot be too large otherwise you would not have enough rebound damping (all oil would flow through the main port and not the piston) so the port must be small enough to restrict on rebound which then makes it too small to flow on compression and the compression shims will lift before any major amount of oil is flowing through the bleed port.

Hopefully that makes sense

You guys can watch this guys videos for a ton of information (he does mtb suspension but has an extensive background in others)

https://youtu.be/LsxWVhpc3II

https://youtu.be/cKd5RqLBECc