Re: Two stage tire pump?

AMuzi <am@yellowjersey.org> wrote:

On 5/10/2025 10:22 AM, bp@www.zefox.net wrote:

Are there any two-stage tire pumps on the market? I'm looking

Such exist:
>
https://giyopumps.com/blog/what-is-a-2-stage-bike-pump/

 If I'm reading right, that's a 2-mode pump, not 2-stage.
The selector gives it away.
 A real 2-stage pump has no selector; the first stage delivers
output to the second stage, the second stage delivers output
to the receiver (tire, in this case). No need for a selector.
If the first stage pressure exceeds that of the tire, the air
just passes through the second stage. If the tire pressure is
higher than the first stage delivers, the air pauses in the
second stage to be compressed again on the return stroke.
 Thanks for writing,
 bob prohaska