I have:
* a Fox branded pump that came with forks about 8 years ago
* a RockShox branded pump that is new, and came with Rebas a couple of weeks ago
* another pump that I don’t know where came from
The Fox pump registers just under 20psi when disconnected, which makes sense because atmospheric pressure is 16psi at sea level I believe. The other pumps register 0.
On my forks, the Fox reads about 20 higher than the others, on the same valve. So they are consistent.
According to the ‘air guide’ on my Rebas, the +ve air for my weight is 120psi. By the RockShox pump, 120psi is concrete hard, I run the about 90psi by the RockShox pump, which is about 110psi by the Fox pump, which is about right. (25% sag).
Who’s right? What gives?
Is this why everyone says Air Guide pressures are too high? RockShox pumps aren’t calibrated to match RockShox Air Guide because they don’t take into account default atmospheric pressure?
Yours, confused of STW