We have an air compressor which, oddly enough, has more than just one function.
The changes in air pressure from one "season" to the next also changes the pressure in our tires and a couple times a year they need to be topped off.
I've had two actual flat tires total with the four vehicles we own, in the past five years of living here. Neither were from nails. One was caused by a sharp stone that got imbedded in the rubber, the other was due to someone placing the stem too close to the edge of the wheel, which cut into the stem.
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