I've been running one of these for about a month now. 170mm Fox 36 Grip2.

At 52psi (with no RUNT) it was Ok off the top but midstroke was too soft and I could never use more than about 150mm travel even on fairly hard hits.

With Runt:
At 45/90psi the midstroke was crazy stiff and I was bouncing off everything and it hurt my hands.
At 40/80psi it was super plush and nice but used up too much travel and too much sag.
At 45/70psi so far it seems just about right.



WIth the runt the midstroke support is great and I also find it easier to use more of my travel on big hits, as there is less of a ramp up effect from the mid stroke to the end stroke. I don't know what the spring curve would look like on paper but suspect it is fairly close to the graphs shown above. All I know is it it feels great on the trail; more support in corners, under hard braking, and on steeps.

What pressure do you run in the low pressure chamber, and what is your riding weight?. Thanks.

What High pressure was used in the runt for that graph ?

It shows the end rate to be about 250% of the rate of running 0 tokens, and in the Midrange about the same as 3 tokens is that correct?

Taking my fox 36 170mm as an example I find it too progressive even running 30% sag. If I install the runt and run it with zero psi in the high chamber, you're saying it is about the same as 1 token.

In that case I would have to run less pressure overall to avoid too high an ending spring rate. Seems to me this will increase sag even further as the runt doesnt have any effect until about midway through the stroke.

Would you agree with my interpretation?

This doesn't appear to reduce end stroke ramp up to less than running 0 tokens does it? Since the maximum air volume won't be any bigger than it previously was. It seems even on its "softest" setting its end stroke ramp up would be more than stock with 0 tokens, simply due to the amount of volume taken up by this device?