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Discussion Starter · #1 ·
it goes from 38/32 to 32/31 in a year(both in summer).

Just curious and don't think it is a big deal even if it is abnormal.

Thanks!
 

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Recommended tire pressure is 33/33.

Loss of pressure in a sound tire can be from permeation through the rubber or from an old valve stem. If your tires are close to being replaced, consider nitrogen inflation. I got tires from Costco and they inflate them with nitrogen. It's inert and won't oxidize the tires as air will and nitrogen won't permeate the rubber as much as oxygen in air. I check my tires every 1000 miles or so and for the past 2 years that I've had the nitrogen inflated tires, have had to put in more nitrogen only when the pressure dropped a pound or so (twice, as I recall).
 

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After awhile, the aluminum rims can start oxidizing inside by the tire bead and that can cause a slow loss of tire pressure. :)
 
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