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Author [ES] [CA] [PL] [PT] [IT] [DE] [FR] [NL] [DK] [NO] [GR] [TR] Topic: Straight Metal Tyre Valves  (Read 1076 times)

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Offline archer8354

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Straight Metal Tyre Valves
« on: February 05, 2018, 11:56:53 AM »
When I replace my tyres I want to fit straight metal tyre valves so I can fit Garmin TPMS caps.  Has anyone in the UK done this and if so where did you get them from?

Offline Bob

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Bob
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Repay no one evil for evil, but give thought to do what is honorable in the sight of all. (Romans 12:17)

Offline TYKE

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Re: Straight Metal Tyre Valves
« Reply #2 on: February 06, 2018, 10:03:41 AM »
I baffles me why mother Kawasaki doesnt fit that type of angled valve as OEM, they are sooooo much easier to use  :125:   
Be wary of an old man in a world where men die young

Roger (Rog)

Offline DaveHilton

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Re: Straight Metal Tyre Valves
« Reply #3 on: February 06, 2018, 10:07:30 AM »
 :89:
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Offline Ireland

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Re: Straight Metal Tyre Valves
« Reply #4 on: February 06, 2018, 12:03:52 PM »
@Archer, I did exactly that. Tyre supplier in Northern Ireland (Crossan) had them in stock, so no issues. Most bike shops should have them, but ask in advance. You can find them online as well and bring your own, but I'm not sure about the correct size.


Offline Throttled

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Re: Straight Metal Tyre Valves
« Reply #6 on: February 07, 2018, 05:41:21 PM »
*Originally Posted by TYKE [+]
I baffles me why mother Kawasaki doesnt fit that type of angled valve as OEM, they are sooooo much easier to use  :125:   

I was told it was because of the centrifugal forces on the valve. It is simpler and cheaper to fit the short straight valves.
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Offline TYKE

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Re: Straight Metal Tyre Valves
« Reply #7 on: February 07, 2018, 06:05:01 PM »
*Originally Posted by Throttled [+]
I was told it was because of the centrifugal forces on the valve. It is simpler and cheaper to fit the short straight valves.

 :028:  wouldn't have thought of that ~ it certainly sounds plausible
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Roger (Rog)

Offline Bob

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Re: Straight Metal Tyre Valves
« Reply #8 on: February 07, 2018, 07:31:31 PM »
Aluminum is very light. I doubt it’s going to hurt anything.
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Offline Paul_Smith

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Re: Straight Metal Tyre Valves
« Reply #9 on: February 11, 2018, 12:02:14 AM »
*Originally Posted by Bob [+]
Aluminum is very light. I doubt it’s going to hurt anything.
At standstill, it won't, but once that wheel starts spinning....
 
The circumference of a standard tyre is about 1.9 meters. At 100kmh (~62mph) it is rotating at:
100km = 100,000 meters in 60 minutes = 1,666 meters a minute at 1.9m per rotation = about 877 rpm
With a radius of 17inches (431mm) that produces a force equivalent to 371 times gravity http://drycake.com/calculator/gforce.php
If the valve weighed 5.6grams (0.2 of an ounce) at rest, it would be weigh 2.1 kilos, over four and a half pounds lbs before you have broken the speed limit.

An angled valve, while much, much easier to access on a bike with disc brakes, means putting a huge force on the angle itself, which almost by definition is the weakest part of the valve. If you are using high quality branded products, then you probably wont have a problem, but given that I managed to bust something as simple and as robust as an oil sump plug today (something I would have thought of as much stronger), I will settle for carrying an angled extension in my toolkit. https://www.ebay.ie/itm/NEW-MOTORCYCLE-MOTORBIKE-TYRE-VALVE-EXTENSION-ADAPTOR-90-DEGREE-ANGLE-CAR-BIKE/221292032043?hash=item338608702b:g:5-IAAOxyAs9SSuEK

 



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