Sorry... tires

[Dizerens5]

That's interesting. I did suspect out-of-balance but have not noticed any sign of it. Tmr I'll weigh the adaptor! Should be possible to counterbalance with something like 30 amp fuse wire. As seen on the photo, on my rig both valves are so close to a spoke that many modern air lines will not fit at all.

[montmil]

I'll look back to my sales receipts and post the source for the tubeless valve stems. The ones I bought are fabricated with a 45-degree angle. As to why BMW put the stem hole so close to the spoke is beyond me.

Be back later...

[georgesgiralt]

The hole is a weakness. Putting it close to the spoke (one of the strongest part of the wheel) help keep the strength of the whole wheel.

[CaptainSlow]

Well, I had a reply from the local BMW dealership (one of the best in the country luckily), and they very strongly advised that tubes should be fitted. Now that may be just a bit or arse covering, but I think I'll fit tubes to be safe - especially as the tyres I want to fit are approved for use with/without tubes anyway.

So its booked in for new tyres and tubes to be fitted in readiness for the MoT (I'm taking the wheels off the bike). I've ordered 100/90 front and 110/90 rear on Bruce's recommendation - thanks for that  

[Dizerens5]

The right-angle valve adaptors weigh 9 grams with end cap in place.

[k_enn]

Well, I had a reply from the local BMW dealership (one of the best in the country luckily), and they very strongly advised that tubes should be fitted. Now that may be just a bit or arse covering, but I think I'll fit tubes to be safe - especially as the tyres I want to fit are approved for use with/without tubes anyway. <snip>

IMO, the small price of the tubes is worth the additional safety that it provides (even if you do not absolutely need tube).  

[bruce_launceston]

"IMO, the small price of the tubes is worth the additional safety that it provides (even if you do not absolutely need tube). "



Two sides to each coin, one reason every modern vehicle runs tubeless tyres is that they are more resistant to sudden deflation in the case of a puncture.

[georgesgiralt]

Well, in France, there are a lot of horror stories about the sudden deflation of tubeless tires on LS wheels...
So ....

[montmil]

Well, I had a reply from the local BMW dealership (one of the best in the country luckily), and they very strongly advised that tubes should be fitted.

Typical "dealer-speak". Especially in our litigious society.

[k_enn]

"IMO, the small price of the tubes is worth the additional safety that it provides (even if you do not absolutely need tube). "



Two sides to each coin, one reason every modern vehicle runs tubeless tyres is that they are more resistant to sudden deflation in the case of a puncture.

It would seem to me that if a tube were to suddenly deflate when you have a tubless tire, the fact that the tire itself is tubless (and even capable of being used on these rims without tubes) should slow down the suddeness of any deflation by keep some of the pressure between the tire and the rim.  Am I missing something?

k_enn

[georgesgiralt]

LS wheels are NOT rated for tubeless tires. They lack the correct profile and so are dangerous when fitted with tubeless tires without tubes.

[bruce_launceston]

Have you looked?

[montmil]

RE: Angled Valve Atem

Took some looking. Finally located the invoice from September 2006. Here's the link:

http://mcenterprises.com/products/search/dsp_searchForm.cfm
Search Key Word: Valve Stem

After the install, I went ahead and balanced the tire/wheel combo.

[Barry]

It would seem to me that if a tube were to suddenly deflate when you have a tubless tire, the fact that the tire itself is tubless (and even capable of being used on these rims without tubes) should slow down the suddeness of any deflation by keep some of the pressure between the tire and the rim.Am I missing something?

k_enn

I agree. The tire should deflate more slowly than it would with a leaky spoked rim. I even go so far as to put an O ring under the valve stem nut to reduce leakage at that point.

[wa1udg]

Hello !
Actually, LS wheels are NOT tubeless rims.
So the tire will NOT be properly seated and can escape the rim !
The manufacturer did not certify these rims for tubeless use. So you have to put a tube into them otherwise you risk a brutal pressure failure  if you run them totally tubeless.
I do not know what they where thinking at BMW at the time with these rims !
At the same time Michelin in France issued a set of special tires which had to be used on special rims. Citroën used them on some cars. If you still have the car, you can't use them because Michelin does not make these tires any more and no other tires fit the rims.... Unless you find standard rims and pay for the certification process...

 Some BMW cars  were sold here with "TRX" tires.  Most owners bought standard size alloy replacements.