Musings of a one-track mind going in ever-decreasing circles.
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The average LP's  groove on each side is about 1,500 feet (460 m) long :-)
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  • 2014-06-07 The Dreck Begins
  • 2014-06-08 Western Swing: The hotbed of understated alcoholism disguised as sexism, disguised as humour.
  • 2014-06-09 Wine in Country Music
  • 2014-06-09 Bicycle tyre valve research.
  • 2014-06-10 Replacing deteriorated dowels on tea trolley
  • 2014-06-10 Book Finished: 3D Printing For Dummies
  • 2014-06-14 If Tabloid Editors wrote song titles...
  • 2014-06-15 Tom Corbett: A Trip To The Moon
  • 2015-06-19 The Crookes Radiometer
  • 2015-07-19 Movie seen: Amy
  • 2015-07-31 Kitty, Daisy & Lewis Concert
  • 2015-08-12 Galloping galaxies! Careering through the Cosmos
  • 2015-08-15 Under the sea, out in space, the omnipresent Flying Spaghetti Monster
  • 2015-08-16 The Scientific Process: Until Proven Otherwise
  • 2015-08-23 Trying to get what I want from a computer.
  • 2015-08-24 Shedding some light on my work process
  • 2015-09-03 You Can't Fight City Hall? My Try for a Safe Path
  • 2015-09-16 My old 10 inch LP - Carlos Montoya - Fiesta Flamenca Nixa SLPY 140
  • 2015-09-20 The 2015 Ig Nobel Prize Winners
  • 2015-09-28 Turf War
  • 2015-10-12 Astoundingly Obvious Facts
  • 2015-10-15 Tearjerkers and classic schmaltz
  • 2015-10-19 An Exploration of non-Flamenco Rumba
  • 2015-10-31 Absolutely Awesome Accuracy: The Cosmic Constancy of the Latest Laser-locked Clock
  • 2015-11-16 The Futility of Ranking Cultures
  • 2015-11-10 The Art of Memory, or just a mess?
  • 2015-11-20 We're trying to get it sorted: - What was your name again?
  • 2015-11-26 What's Up? Blue Origin Have Got It Down!
  • 2015-12-06 E-Voting: - Democratic Innovation, Or Dumb Idea?
  • 2015-12-13 Anti-jokes
  • 2015-12-23 SpaceX Success: Booster Brought Back To Base!
  • 2016-01-01 Marimbula: The Giant Thumb Piano
  • 2016-01-10 Who Says a Dictionary Has To Be Dry?
  • 2016-01-10B Pastafarian Celebrant in NZ
  • 2016-01-17 1951 + 65 = 2016
  • 2016-02-08 Urban Renewal: Preservation or Progress?
  • 2015-02-21 Twinkle Twinkle Little Star Not Where People Think You Are
  • 2016-03-07 Dumbness Proliferates
  • 2016-03-13 Solar Eclipse: - A Different Viewpoint
  • 2016-03-20 Beware! Deep Thought Ahead
  • 2016-03-28 The Rolling Stones - Who Did They Cover?
  • 2016-04-10 On Average, Girls And Boys ARE Different
  • 2016-04-16 ANOTHER SpaceX Success: Booster Brought Back To Barge!
  • 2016-04-24 It's the Hurdy Gurdy, man.
  • 2016-05-02 Another Time, Another Pace: The Musical Rework
  • 2016-05-04 20th Anniversary of Departure for TOSOTW
  • 2016-05-07 SpaceX Barge Ahead With Yet Another Success
  • 2016-05-14 Electrifying Reading: E-Books & E-Readers
  • 2016-05-21 Hyperloop: Another Elon Musk Concept Moves Forward
  • 2016-05-22 Some Fun Things with Wood And Strings
  • 2016-05-28 Rhythm & Blues: Thirty Unearthed Gems 1949 - 1965
  • 2016-06-06 What Is a Blues? The Perils of Binary Thinking
  • 2016-06-18 I Was Thinking in the Shower....
  • 2016-06-26 Food for the Soul: The Women Get Cookin'
  • 2016-07-02 Book Finished: The Invention of Nature
  • 2016-07-18 Book Finished: the address book
  • 2016-07-24 SpaceX Pull Off Yet Another Booster Return
  • 2016-07-31 Book Finished: LANGUAGE The Cultural Tool
  • 2016-08-06 Rocket Science in Simple Terms
  • 2016-08-20 Book Finished: Deadly Beautiful
  • 2016-09-26 Book finished: The Decameron of Giovanni Boccaccio
  • 2016-10-31 Book finished: Erewhon by Samuel Butler
  • 2016-11-21 A Microwave Oven Rescued
  • 2017-01-02 Book finished: The Life and Death of Cormac the Skald
  • 2017-01-03 Book finished: Toledo, the Story of an Old Spanish Capital
  • 2017-02-05 Book finished: Adventures in the Unknown Interior of America
  • 2017-03-05 Sarah Jarosz Awarded Two Grammies
  • 2017-04-02 SpaceX: - Second Time First!
  • 2017-04-24 Tony Joe White: Storyteller of the Southern Swamps
  • 2017-05-01 Book finished: The Prince

Bicycle tyre valve research

It's just a simple thing you would think.
All I want to do is pump up my bike tyres.


My bike, an old Healing 10-speed, has two different wheels. (It's a long story) The front one has the type of valve I have seen on bikes since I was a child. The rear one has a car-type tyre valve favoured these days.

        Q.    Which exact type is on my bike back wheel?

Types of car valve: -

Schrader
American and most common on nearly all cars worldwide
Larger, 8mm diameter. Has spring to close valve
External thread    Metric: 7.7 mm OD, thread root diameter is 6.9 mm × 0.794 mm pitch.
Internal thread    Metric: 5.30 mm OD × 0.706 mm pitch. (takes the threaded valve core)

        A. Schrader

This one is OK at the garage pump, because the chuck is press-on, once the desired pressure is reached, it can be removed quickly without allowing air out of the tyre.
    With the screw-on hand pump connector, the valve remains open while you are unscrewing the connector, and a lot of pressure is lost. It is annoying to get good pressure with lots of pumping, only to have it leak away while unscrewing the connector.


        Q.    Which type is on my bike front wheel?

Types of bike valve: -
    Go the whole hog here  Indian Standard

Presta
One of three used on bicycles. (Other two are above and below.)
(also called Sclaverand valve or French valve) is a valve commonly found in high pressure road style and some mountain bicycle inner tubes (Wikipedia)
Smaller, 6mm diameter, no spring, held closed by internal pressure.

Dunlop/Woods
Mentioned all over the web, but I cannot Google specs in text form. Definitely mine.

        A.    Dunlop/Woods valve.

    The bike shop sold me a Woods valve adaptor  to the Schrader size.
It doesn't work with the garage Schrader chuck, there is nothing inside to open the internal valve of the chuck. You press the  chuck to the valve and nothing happens.
I cannot find a diagram for the chuck on the internet.
You can get them from China for US$ 0.50 each, but who knows what is inside?
    Some (few these days) chucks have a pressure-applying lever at the chuck, these will work.

Update: I discovered the Woods adaptor
is probably not meant for the garage chuck.
It works fine as an adaptor to connect my bike pump's rubber connector with a  Schrader fitting, to the Woods valve. Now I don't have to carry both Woods and Schrader rubber connectors for the pump.

        Q, How to adapt the Schrader chuck to my Woods valve
so I can inflate it at the garage?
Picture
I search "woods to schrader adaptor"

and the top hit is EXACTLY the opposite of what I want   :-)

Picture
Here is the problem: This 38th hit is listed as:
"Valve adaptor with rubber O-ring. Use this on a presta (or the older English/Woods valve) to enable pumping from a service station pump."
I can almost guarantee it will not work at the service station pump. As I said above, there is nothing inside to open the internal valve of the chuck. It will work with a hand pump because the pump connector does not have a valve.

        A. No solution found
.

        Q. How to get round the loss of pressure disconnecting from the Schrader valve?


Search "schrader with hand pump disconnecting"


This product seems to be aware of the problem, especially Question 5 at the bottom.

This product addresses the problem rather expensively at
US$49.00, but is called a Shock Pump, I'm guessing it is designed for low-volume high-pressure work on bike shock-absorbers (Dampers, actually :-)

This site acknowledges the problem
but  gives no solution.

        A. No solution found.


So far then: -
I can pump the Woods up by hand, but not at the garage, except maybe sometimes.
I can pump the Schrader up at the garage, but not satisfactorily by hand.

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