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Message: <blockquote data-quote="evan2000" data-source="post: 1792769" data-attributes="member: 38">donCityZ,Yes you got your point. Indeed our atmosphere consist of about 78% of nitrogen.Nitrogen got relatively larger molecules compare with CO2, O2 and others. Therefore is relatively harder/ slower to escape thru the gap between rubber and rim. This is one of the reason they say no need to fill up air at a longer period( i dun agree with 5 months thingy too, its just selling gimmick)Secondly, nitrogen also a "lazy" gas molecule compare with other kind of gases, more energy needed to change it. Ie: less expanding property like what you said. This is also another reason of less pressure lost to the tyre. As we know higher tyre pressure, more gases easier to escape.Why we need to pay to get nitrogen? Well, actually we pay to get a higher percentage(%) of nitrogen. Depend on the nitrogen generator that used by tyre shop, some can chunck out about 90-95% of nitrogen and pump in ur tyre.Some use pure nitrogen gas from MOX cylinder will got almost 100% nitrogen.And actually, the nitrogen generator will filter out dirts, and another major tyre enemy====moistThe moist penetrate into the tyre, rust will happen on those steel belt/cord. When rust happen, tyre belt leaving the tyre casing, and other tyre damage will happen.Thats what i know, and hope solve the doubts herecheers</blockquote>

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