Just a quick question here....I store my equipment in my garage in the off season. It seems that about every ten days or so I have to go out and re-inflate the tires on the rear of the machines. Some one said it is because I store the machines on a bare concrete floor. I have a hard time with that one but who knows. Been doing this for 11 years now and it is the same every year. Any input? Any way to stop it?