How do they get all the air out? Another point; When the tyre mounting guy mounts your tyres on the rim, does he use a water based lubricant to assist the tyre bead to seat on the rim? How do you keep that moisture out of your dry nitrogen tyre fill?
The only concern about having Oxygen in your tires is oxidation. And, truly, I think the bigger issue is having water vapor. Your tires will oxidize inside and out, though there will be a ready supply of oxygen in the atmosphere, compared to a fixed supply inside the tire. Oxidation of the tire isn't the greatest concern, it is oxidation of the metal wheel and/or oxidation of any sealant/lubricant used for seating the tire. I had some alumninum alloy wheels years ago that had this problem. If I had filled that car's tires with Nitrogen, it may have had a difference. The Oxygen, under pressure and at elevated temperatures, and with the addition of more Oxygen through the water vapor, will have the opportunity to oxidize whatever else may be around. Does this mean I look to put Nitrogen in my tires? Not on your life. If it were available for free, I'd consider it, but only if the gas was known to be pure, not just pulled from the atmosphere. Most Nitrogen used at dealers is likely coming from a special pressure tank that uses ambient air to provide the Nitrogen. It cannot get all of the water vapor out, so I don't see that you could be ahead in the game this way.
I just read an interestig article on jello filled tires. Here is the link. It seems that jello, being a semi liquid, will completely fill the cavity in the tire, and still allow the tire to maintain it's flexibility. The tire is them able to hold its round shape, but flex when a road bump is incountered. It seems the only question that perplexes people when ordering the jello filled tires is: What flavor.
