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From: AMuzi <am@yellowjersey.org>
Newsgroups: rec.bicycles.tech
Subject: Re: Two stage tire pump?
Date: Sun, 11 May 2025 09:19:18 -0500
Organization: Yellow Jersey, Ltd.
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On 5/11/2025 12:40 AM, bp@www.zefox.net wrote:
> 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
> 

Thanks I missed that

-- 
Andrew Muzi
am@yellowjersey.org
Open every day since 1 April, 1971