I filled it up and it’s OK after a week. Why did it go flat and then not go flat again?

Piss off any of the neighborhood kids?

Are you sure it’s OK? Pressure could be low but you barely notice it.

Quote
special
Are you sure it’s OK? Pressure could be low but you barely notice it.

I kicked them and they are full.

Sitting on the nail or ?? Maybe move the car slightly so that it's sitting on a different portion of the tire and see if it happens again?

I kicked them and they are full.

A pressure gauge will work well in that situation.

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We will remember them.

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I *love* SIGs. It's Glocks I hate.

Probably a slow leak. Air leak rate can vary depending on the position of tires when parked.

Quote
MikeF
Sitting on the nail or ?? Maybe move the car slightly so that it's sitting on a different portion of the tire and see if it happens again?

That would be my first guess.

Quote
RAMd®d
I kicked them and they are full.

A pressure gauge will work well in that situation.

Indeed. Kicking the tire(s) is only pass/fail, you need to know if the tire in question is losing air before it goes completely flat, and if so how much over what amount of time.

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Had to replace wheel with a tiny nick on the rim. The tire would go flat if parked in a certain position.

Todd’s psi-key evaluation board

Be sure to keep a pump in your car!

Someone could have let the air out.

There could be a foreign object in the tread that only leaks are when the tire is resting on it.

Fill the tire above the recommended pressure.

Squirt a solution of soapy water on the tire, then move the car so the tire rotates some, and squirt some more.

Without some additive, leaks seldom heal themselves.

---

I am that Masked Man.

All you can do, is all you can do.

There’s trouble — it's time to play the sound of my people.

Your boos mean nothing to me, I've seen what you cheer for.

Insisting on your rights without acknowledging your responsibilities isn’t freedom, it’s adolescence.

I've been to the edge of the map, and there be monsters.

We are a government of laws, not men.

Everybody counts or nobody counts.

When a good man is hurt,
all who would be called good
must suffer with him.

At the going down of the sun and in the morning
We will remember them.

You and I have memories longer than the road that stretches out ahead.

There is no safety for honest men except
by believing all possible evil of evil men.

We don’t do focus groups. They just ensure that you don’t offend anyone, and produce bland inoffensive products. —Sir Jonathan Ive

An armed society is a polite society.
And hope is a lousy defense.

You make me pull, I'll put you down.

I *love* SIGs. It's Glocks I hate.

Also, depending on how long it was sitting flat, it may have damaged the tire. I blew out a tire that had been flat for an unknown amount of time after I filled it up and drove on it for a bit (luckily it happened in stop and go traffic).