Just wanted to tag onto this important thread about tires. When I read where someone mentioned NITROGEN in tires. Is this scam still going around? As a scientist, working in the Atmospheric field, it is important that everyone knows the very air you breath is made up of several gasses. Nitrogen averages 72% of the atmosphere It is impossible for anyone to replace all of the air in a tire with 100% pure nitrogen since there will always be regular air in the deflated tire. So the nitrogen they sell you is diluted to about the 70% level in normal atmosphere. Unless the tires are deflated in a vacuum then only Nitrogen were added in that vacuum. Please , save your money and never pay for nitrogen to be added to your tires