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Adding nitrogen? Why bother - normal air is 78% nitrogen anyway! Sure nitrogen is inert whereas the oxygen in air is an oxidising agent (hence can maybe degrade rubber) but my guess is that you will wear out the tyre by driving on it long before you need to worry about any deterioration or hardening of the rubber compounds within the tyre! I could be wrong of course and I am certainly no expert but adding nitrogen sounds more like a gimmick to me!
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