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Path: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail
From: bp@www.zefox.net
Newsgroups: rec.bicycles.tech
Subject: Re: Two stage tire pump?
Date: Sun, 11 May 2025 05:40:42 -0000 (UTC)
Organization: A noiseless patient Spider
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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