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Spare tires have evolved over the years from 2 to 1 to a donut and now to an air compressor. The photo above is what your state of the art spare tire looks like. Let's give it a test;

I wanted to see if this ContiMobilityKit could be used as a simple method of checking tire pressure and making changes as required. I am very happy with the results. No need for the "goo" bottle unless you have a flat. The compressor once plugged into your auxiliary jack will reach all four tires with ease. I found the air pressure meter gave me the same PSI reading as a digital gauge. Over the years I have found that using those air pumps at gas stations and even dealers puts water into your tires. When your tires get hot, your PSI will really increase due to water vapor. Using this on board compressor will not put any water into your tires plus if you have it, you might as well use it...It's kind of funny as tires on cars got larger and larger, your spares got smaller and smaller and now none at all. Pascha