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Discussion Starter · #1 ·
Hi all,


I recently changed to use a Rockshox digital shock pump, also have a DVO shock pump and a Rockshox shock pump.

Noticed that the digital pump is 10psi less when comparing with the other two.
Example if digital pump shows 100psi, the other two will be 110psi.

Not a problem to offset the psi from now on, but just wondering anybody else have Rockshox digital pump notice the same air increase?
 

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It’s hard to say unless you have all 3 connected to the pressure source simultaneously. This is because the volume of air that fills the pump and air lines can be different between models. That said, you are probably on the right track, but you will want to find a way to verify the accuracy while the pump is connected.

That said, most people stick to one known good pump as their golden calibration as the pump may not be accurate, but as long as it is consistent, things are acceptable.

Same deal with tire pressure gauges. Lots of low quality ones on the bicycle market.
 

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Discussion Starter · #3 ·
It’s hard to say unless you have all 3 connected to the pressure source simultaneously. This is because the volume of air that fills the pump and air lines can be different between models. That said, you are probably on the right track, but you will want to find a way to verify the accuracy while the pump is connected.

That said, most people stick to one known good pump as their golden calibration as the pump may not be accurate, but as long as it is consistent, things are acceptable.

Same deal with tire pressure gauges. Lots of low quality ones on the bicycle market.
Ya, at least it's consistent.

Not sure is there anyway I can accurately test it here with some machine perhaps?
 

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Pay for a certified calibration.

Misplaced enthusiasm
This. All around.

You need to connect the pump at full compression, read the pressure, disconnect it, then reconnect it again. The difference is how much air is "lost" connecting it; I'm willing to bet the difference is minimal.

Anyway, even if the calibration is accurate, the dials are so small that the resolution is crap. Pick your poison.
 
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