air leaks from tires

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W. Wells - 11 Feb 2008 16:28 GMT

I have a SC430 with BBS rims. Lately air has been leaking from all four
tires. I asked the rim man and he suggested the pressure monitors in the
stems may be worn out. He said they usually last 10 years at the most. He
suggested to replace them rather than put in a rebuild kit. Any info from
other owners?

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Ray O - 12 Feb 2008 05:18 GMT

>I have a SC430 with BBS rims. Lately air has been leaking from all four
>tires. I asked the rim man and he suggested the pressure monitors in the
>stems may be worn out. He said they usually last 10 years at the most. He
>suggested to replace them rather than put in a rebuild kit. Any info from
>other owners?

I think you should inflate the tires to the maximum indicated on the
sidewalls and submerge them in water or spray with a dishwasher detergent
and water mixture to find the source of the leaks. It is possible that the
wheels are porous or that leaks have developed where the bead meets the rim.

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Ray O
(correct punctuation to reply)

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Jerohm - 13 Feb 2008 16:24 GMT

> I think you should inflate the tires to the maximum indicated on the
> sidewalls and submerge them in water or spray with a dishwasher detergent
> and water mixture to find the source of the leaks. It is possible that
> the wheels are porous or that leaks have developed where the bead meets
> the rim.

This is MY guess... 'cause I have been through this (they can be ground
smooth again). I have the most problem with the pair mounted in the front,
where all the weight is. Also 5/lb over recommended coupled with long trips

> 500mi, seem to seal things up for a while.

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Jay Somerset - 13 Feb 2008 21:20 GMT

>> I think you should inflate the tires to the maximum indicated on the
>> sidewalls and submerge them in water or spray with a dishwasher detergent
[quoted text clipped - 6 lines]
>where all the weight is. Also 5/lb over recommended coupled with long trips
> > 500mi, seem to seal things up for a while.

Normally 5 pounds over recommended is fine, but on the wide, low
profile OE tires (Dunlops in Canada) this is too much, and you will
find that the center of the tread will wear significantly faster than
the outside. 10-15% less life on a ridiculously short tire life just
adds insult to injury. :-)

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Jay (remove dashes for legal email address)

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ACAR - 12 Feb 2008 12:23 GMT

> I have a SC430 with BBS rims. Lately air has been leaking from all four
> tires. I asked the rim man and he suggested the pressure monitors in the
> stems may be worn out. He said they usually last 10 years at the most. He
> suggested to replace them rather than put in a rebuild kit. Any info from
> other owners?

how old are the tires?

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greg - 13 Feb 2008 04:03 GMT

Have the stems themselves ever been changed? They are unique to Lexus'
with tire pressure monitors and are a separate part.

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johngdole@hotmail.com - 04 Mar 2008 04:37 GMT

Ask the shop to put each in the tub they use to check for leaks. You
should be able to tell exactly where it's leaking from.

> I have a SC430 with BBS rims. Lately air has been leaking from all four
> tires. I asked the rim man and he suggested the pressure monitors in the
> stems may be worn out. He said they usually last 10 years at the most. He
> suggested to replace them rather than put in a rebuild kit. Any info from
> other owners?

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