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From: AMuzi <am@yellowjersey.org>
Newsgroups: rec.bicycles.tech
Subject: Re: Two stage tire pump?
Date: Tue, 13 May 2025 09:23:06 -0500
Organization: Yellow Jersey, Ltd.
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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
> for a frame-sized pump that makes it a little easier to get
> near 100 psi. Best I know of is the Topeak Road Morph, but it's
> single stage and takes most of my weight to surpass 100 psi. Not
> impossible, but sure to get harder with time.
> 
> A pump that perhaps doubles or triples pressure on the pull stroke
> and then delivers output on the push would help a great deal.
> 
> I do have an old "WindPipe", from Specialized. This is two-mode,
> not two-stage. It uses a very small-bore cylinder for high pressures
> and a co-axial large-bore cylinder for low pressure. The internal seals
> gave up and it no longer develops any pressure at all. Far as I can
> tell they're no longer offered. It was helpful while it worked, but
> being single-stage the volumetric efficiency was always lousy.
> 
> Thanks for reading,
> 
> bob prohaska
> 


Just saw this while looking for something else:

https://www.topeak.com/global/en/product/1142-ROADIE%20DA%20G

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