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Hi SVO boy, it turns on whenever the tire runs below a user-defineable air pressure. Most likely, the user/mechanic would set this pressure before installation.
I haven't really found any other self inflating tire devices on the car market at this time - do you know of any?
There are other self inflating tire devices that I know of, but they are more expensive, are for truck and fleet use, and are not made for cars.
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