A
Art Harris
Guest
After the previous thread on frame fit pumps that can be installed
under the top tube using a pump peg, I got myself a brand new Zefal
HPX-4 pump with the ASV (Auto Select Valve) feature.
Out of the box, it seems to work fine with my Presta valves. I just
press the head onto the valve with the thumblock lever parallel to the
pump. Then I flip the thumblock perpendicular to the pump and start
pumping. I can get ~100 psi without too much trouble.
I've read several reviews online that say Presta users should open the
pump head and flip a plastic piece around to improve performance. Some
even say the pump won't work at all with Presta valves if this isn't
done.
What experiences have others had with this pump and Presta valves?
Will I get easier pumping if I do the flip?
Thanks,
Art Harris
under the top tube using a pump peg, I got myself a brand new Zefal
HPX-4 pump with the ASV (Auto Select Valve) feature.
Out of the box, it seems to work fine with my Presta valves. I just
press the head onto the valve with the thumblock lever parallel to the
pump. Then I flip the thumblock perpendicular to the pump and start
pumping. I can get ~100 psi without too much trouble.
I've read several reviews online that say Presta users should open the
pump head and flip a plastic piece around to improve performance. Some
even say the pump won't work at all with Presta valves if this isn't
done.
What experiences have others had with this pump and Presta valves?
Will I get easier pumping if I do the flip?
Thanks,
Art Harris