On Sat May 10 15:22:38 2025 [email protected] 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, what kind of tire are you pumping that high?

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)