Never!
The "195" part of p195/70r14 is a measurement in millimeters! This is the width of the tire.
The "70" part is an aspect ratio between the width and sidewall height. Meaning that on a P195/70R14 tire, the sidewall will be 136.5mm tall. (195*0.7=136.5)
The "14" part is the diameter of the rim (not the rubber).
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