Re: Two stage tire pump?

On Tue, 13 May 2025 09:23:06 -0500, 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
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

Nice, but I'll miss the fold out foot stand of my Topeak Road Morph G.

--
C'est bon
Soloman