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Dual valve floor pump only pushes air out the Schrader valve hole



 
 
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  #11  
Old April 28th 17, 11:55 AM posted to rec.bicycles.tech
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Default Dual valve floor pump only pushes air out the Schrader valve hole

On Friday, February 3, 2006 at 7:20:58 PM UTC-5, Brad Ford wrote:
I've got a cool little Wrench Force floor pump that will accept
Schrader or Presta. I've used it for over a year exclusively to
inflate my Presta road tubes. Got the kids bikes for Christmas, pumped
them up (Schrader valves), and now (several weeks later) the pump won't
blow air out the Presta hole any more. It's supposed to be "auto
sensing". Is it just buggered? What would you all try to debug this
problem?


I had let my road bike tires go completely flat then encountered the same problem when I tried to inflate them, with a different brand of dual-valve floor pump that had always worked until then. I tried the trick of covering the open Schrader valve with your thumb, but it didn't work for me. It did cause a lot of pressure on my thumb and some very entertaining noises when air squeaked out! What ultimately worked was to inflate the tires of another bicycle (which also uses Presta valves) which had mostly full tubes already, then go back and inflate the flat road bike tires. It seems that persuaded the pump to switch back to its Presta setting. Good luck to all!
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  #12  
Old July 14th 18, 08:20 PM posted to rec.bicycles.tech
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Default Dual valve floor pump only pushes air out the Schrader valve hole

You dont cover the open schraeder valve, you loosen the nut holding the presta stem to the bike wheel so you can press the valve stem through to the tire side. When you can feel it through the tire then press on the tire side so that pressure can build inside the valve stem while operating the pump. This causes the auto valve to lock out the schraeder side of the pump head..
  #13  
Old July 20th 18, 06:34 PM posted to rec.bicycles.tech
Andre Jute[_2_]
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Default Dual valve floor pump only pushes air out the Schrader valve hole

On Saturday, February 4, 2006 at 12:20:58 AM UTC, Brad Ford wrote:
I've got a cool little Wrench Force floor pump that will accept
Schrader or Presta. I've used it for over a year exclusively to
inflate my Presta road tubes. Got the kids bikes for Christmas, pumped
them up (Schrader valves), and now (several weeks later) the pump won't
blow air out the Presta hole any more. It's supposed to be "auto
sensing". Is it just buggered? What would you all try to debug this
problem?


Rather than all these tiresome workarounds, why not just buy an SKS Rennkompressor? Works right every time. Trusted by TdF mechanics. Fully rebuildable with universally available spares, as it has been for half a century.

Andre Jute
If it's good enough for me, it's good enough for you
  #14  
Old July 20th 18, 09:01 PM posted to rec.bicycles.tech
Emanuel Berg[_2_]
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Default Dual valve floor pump only pushes air out the Schrader valve hole

Andre Jute writes:

I've got a cool little Wrench Force floor pump that
will accept Schrader or Presta. I've used it for
over a year exclusively to inflate my Presta road
tubes. Got the kids bikes for Christmas, pumped
them up (Schrader valves), and now (several weeks
later) the pump won't blow air out the Presta hole
any more. It's supposed to be "auto sensing". Is it
just buggered? What would you all try to debug
this problem?


Rather than all these tiresome workarounds, why not
just buy [...]


Buy stuff. Solution #1 in the bicycle world.

--
underground experts exiled
  #15  
Old July 21st 18, 12:00 AM posted to rec.bicycles.tech
Andre Jute[_2_]
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Posts: 8,722
Default Dual valve floor pump only pushes air out the Schrader valve hole

On Friday, July 20, 2018 at 9:01:39 PM UTC+1, Emanuel Berg wrote:
Andre Jute writes:

I've got a cool little Wrench Force floor pump that
will accept Schrader or Presta. I've used it for
over a year exclusively to inflate my Presta road
tubes. Got the kids bikes for Christmas, pumped
them up (Schrader valves), and now (several weeks
later) the pump won't blow air out the Presta hole
any more. It's supposed to be "auto sensing". Is it
just buggered? What would you all try to debug
this problem?


Rather than all these tiresome workarounds, why not
just buy [...]


Buy stuff. Solution #1 in the bicycle world.


Oh, I agree with you; I have nothing but contempt for bicycle fashion victims. That's why I mention the SKS Rennkompressor, probably the most old-fashioned pump still on the market. I bought two SKS Rennkompressors about ten years ago and haven't bought a pump since. What matters is not how often you buy, but how smart you buy.

Andre Jute
Function is value, not fashion
  #16  
Old July 21st 18, 01:30 AM posted to rec.bicycles.tech
Emanuel Berg[_2_]
external usenet poster
 
Posts: 1,015
Default Dual valve floor pump only pushes air out the Schrader valve hole

Andre Jute writes:

Buy stuff. Solution #1 in the bicycle world.


Oh, I agree with you; I have nothing but contempt
for bicycle fashion victims. That's why I mention
the SKS Rennkompressor, probably the most
old-fashioned pump still on the market.


Obviously you like things that work, be it new or old,
but be it functionally equivalent, I like the old
things the more, and old stuff (that works) I have
noticed tends to impresse outside people much more.

I really don't know why, maybe they think "here is
a machine that has been used by tons of people who
knows there stuff, and it has been used the right way,
and cared for the right way, so it still works".
With new things, maybe people think "OK, so this is an
item anyone can buy, anyone who does something
successfully enough, something that probably is
something I don't understand or respect".

Or perhaps this is over-analyzing, perhaps people just
like the industrial romantics of the lost industrial
age in our countries.

I have noticed even females like old machines and they
are not the people to be into gear and equipment
otherwise, well the majority of them at least.

--
underground experts exiled
  #17  
Old July 25th 18, 11:00 PM posted to rec.bicycles.tech
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Posts: 257
Default Dual valve floor pump only pushes air out the Schrader valve hole

On Friday, July 20, 2018 at 10:34:54 AM UTC-7, Andre Jute wrote:
On Saturday, February 4, 2006 at 12:20:58 AM UTC, Brad Ford wrote:
I've got a cool little Wrench Force floor pump that will accept
Schrader or Presta. I've used it for over a year exclusively to
inflate my Presta road tubes. Got the kids bikes for Christmas, pumped
them up (Schrader valves), and now (several weeks later) the pump won't
blow air out the Presta hole any more. It's supposed to be "auto
sensing". Is it just buggered? What would you all try to debug this
problem?


Rather than all these tiresome workarounds, why not just buy an SKS Rennkompressor? Works right every time. Trusted by TdF mechanics. Fully rebuildable with universally available spares, as it has been for half a century.

Andre Jute
If it's good enough for me, it's good enough for you


The pump head isn't deep enough for the Presta valve so sometimes it doesn't form a seal if you have your bike in the stand. It most definitely IS a good pump but it does have some problems too. And you have to turn the "lock" in the correct direction for Presta or Schrader. Now that I've had that concussion it's sometimes difficult to remember which way locks which valve.
 




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