Here's a mystery. Last January, my mechanic installed a set of Nokian WR
>tires on my 2002 Tacoma. Great tires for snow & rain, but they have a
>constant problem with losing more air than any tire I've dealt with in 35
>years of driving. Example: I'll fill them to 34 lbs (cold) when it's 40
>degrees outside and a week later, they're down to 22-25 at the same outdoor
>temperature. One of them was down to 15 yesterday. The truck came with
>Goodyears which were useless in snow, but had no such problems on the same >wheels.
>
>I've been going to these mechanics for 20 years and they're no hacks.
>They've been endlessly helpful in trying to solve the problem. Typically,
>when tank testing the tires, they've found miniscule leaks around the
>balancing weights, so they've tried different weights, to no avail. They
>found little or no corrosion on the rims.
Are these alloy or steel rims? If they can see a miniscule leak, that's where it's leaking from - it doesn't tale much of a leak to drain a tire in a week.
Alloys can get scratched at the rim easily and leak - there are paint-on rim sealing compounds that can be used. But to make it easier on yourself, get a separate set of steel rims for the snows, so you aren't changing tires on those alloy rims twice (or more) a year.
It's also possible that a gorilla at the tire store didn't apply enough soap or manhandled them during mounting and ripped the bead sealing area on the Nokians. It should be visible, but...
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