Rota "twin Valve System" ? Wtf

[Usual Suspect]

has anyone got an idea why rota is putting two valve stems on some of their wheels now?

the only reason i can think of is if your trying to stretch the tyres, it may help getting air in there to pop it onto the bead??

i just think its a stupid idea

[istdercollen]

It's for TPMS Tire Pressure Monitoring System. At least that's what it's for on other two stem rims.

[89CAL]

perhaps it just makes it easier to pump up/check tire pressures as theres 2 valves?

[jrm]

I thought it was mostly used for cars where you nitrogen-fill vs oxygen-fill (something to do with sucking out the air when you nitrogen fill?), but it might have been an old wives tale I overheard..

[istdercollen]

Pretty sure it's just for newer cars with tire Pressure monitoring. The second valve keeps the system from being tripped and showing a warning light on your dashboard.

[lidz]

i would've assumed it was because someone else did it

[joeyjoejoejuniorshabadoo]

i would've assumed it was because someone else did it

champagne comedy

[On Edge]

i would've assumed it was because someone else did it

Great line LMAO

[jrm]

I thought it was mostly used for cars where you nitrogen-fill vs oxygen-fill (something to do with sucking out the air when you nitrogen fill?), but it might have been an old wives tale I overheard..

To further above comment, I'm guessing I must have heard it multiple places - googled and found these:

http://www.skylinesaustralia.com/forums/in...t&p=4706132

http://www.trackchat.com.au/forum/showthread.php?t=2976 also mentions it (post #18)

http://au.toyotaownersclub.com/forums/inde...st&p=303028

http://www.karttechnik.com/news/?p=712

.. which seem to support what I've said. However, the post at http://www.karttechnik.com/news/?p=712 suggests it could be to fill the tyre up, whilst checking the tyre pressure with the other with a dedicated meter - this also seems plausible.

Either way, more manufacturers than just rota are doing this, and finding it on a rota rim is really just because they've "borrowed" the design from another manufacturer.