Re: Two stage tire pump?

AMuzi <am@yellowjersey.org> wrote:

 
 
Just saw this while looking for something else:
 
https://www.topeak.com/global/en/product/1142-ROADIE%20DA%20G

That's a single-stage dual-acting pump: "Dual-Action (DA) doubles
volume with each stroke". The design allows maximum pumping speed
with the smallest possible pump. The claim of 120 psi likely requires
the arms of an Olympic-class weight lifter. For a young, fit,
athletic bicyclist it's no problem. For a wizened old fart
like me, out of the question 8-) 

Still, it looks like a compact, reasonably fast acting pump. Emphasis
on compact.

Thanks for writing,

bob prohaska