Tire Pressure

Aug 09, 2008 15:15

I don't know how to read the tire pressure gauges attached to gas station air pumps. When I attach the nozzle to my tire, a piston pops out that should tell me the tire's pressure, but I don't know what units it's using.

A sticker on the body of my car just inside the driver's side door tells me to inflate my front tires to 210kPa or 30PSI, and the back tires to 200kPa or 29PSI, but all the gauges I've seen have single-digit markings. Are these hundreds of kPa, or tens of PSI, or something else?
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