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Snowflake wheels and valve stem length
- huntmiller
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Snowflake wheels and valve stem length
1965 R69s w/Wixom fairings and bags
1979 R65 w/Siebenrock 860cc, Luftmeister fairing
- schrader7032
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Re: Snowflake wheels and valve stem length
https://bmwmotorcycletech.info/section6.htm
Near the bottom he talks about valve stems.
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
- huntmiller
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Re: Snowflake wheels and valve stem length
1965 R69s w/Wixom fairings and bags
1979 R65 w/Siebenrock 860cc, Luftmeister fairing
- schrader7032
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Re: Snowflake wheels and valve stem length
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
- huntmiller
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Re: Snowflake wheels and valve stem length
1965 R69s w/Wixom fairings and bags
1979 R65 w/Siebenrock 860cc, Luftmeister fairing
- schrader7032
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Re: Snowflake wheels and valve stem length
Snowbum does mention the use of the inner nut on this page...he has it in a HOW TO DO IT section about 2/3 down the page under Details #3.
https://bmwmotorcycletech.info/TireRepair.htm
It seems to be associated with using a tube in a tubeless rim because of the difference sizes of the rim hole that accepts the valve stem.
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
- Flx48
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Re: Snowflake wheels and valve stem length
Standard method is the curved washer resides between the inner tube and the rim; (protecting the stem bond with the tube) first nut is used to secure the tube in position during tire installation; (then backed off 1/4" or so, to monitor any tire slippage from hard braking or acceleration that would show as the stem leaning over) second nut is used to secure valve cap, as protection against loss. (it is thought that a weak valve stem spring will lose air pressure from the centrifugal force of the spinning wheel, and a valve cap, with its o-ring intact, would maintain pressure, or at least slow down air loss)
Motocross guys used to put one nut on the inside (between tube and rim) and the second one hard down on the outside, to clamp the tube to the rim, an effort at trying to prevent to prevent loss of the valve stem that could occur because they ran such low pressure the tire would shift about the rim.
I have no idea if this is still the practice, and don't feel it's good practice with the pressures we use.
More folks are starting to use tubeless tires on the older wheels, (snowflakes and spoked) for perceived better tire availability, the technology to retrofit is apparently here.
I have no need for higher performance than I have, and so I stick with the tube type tires, plus they're much easier to mount.
Best-
George
- huntmiller
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Re: Snowflake wheels and valve stem length
1965 R69s w/Wixom fairings and bags
1979 R65 w/Siebenrock 860cc, Luftmeister fairing
- srankin
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Re: Snowflake wheels and valve stem length
Despite TIRES being made to run tubeless, and owners and some mechanics finding they could be run tubeless on BMW snowflake wheels, and since the vast majority of tires on the market now are tubeless, they of course eliminated the tube and saved a few bucks.
I won't go into that can of worms it has been hashed out for years in various forums. Again I agree with Kurt on it.
As for spoked wheels, well only until BMW redesigned the spoked wheel in the newer bikes to take and use actual tubeless tires, all of the old BMW spoked wheels need tubes to hold air. There is no getting around that.
The modern spoked wheels are also now on bikes designed to run radial tires not bias belted. Same for the modern cast wheels.
If there is a tire company making radial type tires for the classic or vintage BMW bikes, I am not aware of it. Regardless even if there is, these tires despite being called tubeless should have or will need to have tubes in them to fit the snowflake or spooked wheels on the classic or vintage bikes. Unless there is some specific disclaimer by the tire company to go against BMW's requirement. This applies only to the snowflake wheels as the spoked wheels won't hold air without a tube.
One comment I can make on the modern radial tubeless tires is they can be a royal B to mount and inflate even with modern Motorcycle tire machines. St.