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I don't think it's arbitrary, although obviously you're right in that it's difficult to know what 24psi feels like when you're not sure of the starting point.
If you've got a bicycle with set values for tyres width, pressure etc, then replacing the seatpost will feel like you have reduced the psi by (for example) 24psi. We just don't know what the starting values are. I would presume some kind of industry standard like 25c tyre, 100psi or something. Regardless, it's an interesting study. I'm trying to get hold of Josh from Silca's email to bother him about the data.
MechaMorgan-
Message him on Linkedin haha
https://www.linkedin.com/in/josh-poertner-06665b17/ -
I want to get stickers made that say 'minus 27 psi'
PhilDAS
amey
No I'm just saying that an arbitrary figure like 24 PSI is bullshit.
Because as I mentioned a minute ago, 24psi from 30 is a lot more of a difference than 24psi down from 120 or 150.
It is only 24 psi difference from one exact starting pressure, which is not disclosed so essentially, the only thing we know is that the vcls is "some" amount comfier.