[guitarguylp]

Originally Posted by Tom K.

Does that tire shop completely evacuate the air prior to the nitrogen fill?

I've been putting nitrogen in my tires for over 50 years and have never had a tire rot from the inside. But I use a special 78% concentration which I get for free.

Tom

That is great!!! I have heard a lot of people concerned about the harmful effects of Nitrogen if it leaks not realizing that air is 78% nitrogen.

I think the benefit depends on how long you have your tires for. The winters for my wife's car are 8 years old they are starting to rot a bit, but the tread has about 2-3 years left on them. I am not sure if these would have lasted as long without the nitrogen. If your tires only last about 3-4 years I am not convinced that there is much benefit to the nitrogen, but I am not sure about the other claimed benefits of nitrogen.

I don't think that they completely evacuate the tire before filling it up I think they just use nitrogen to fill up the tires. I would think that putting the tires under vacuum could un seat the bead on the tire since rims are designed to hold the tire under pressure, not under vacuum. I think they just have a nitrogen filter feeding the air compressors, and since they don't charge for it you can't go wrong.