I have stored my 1930 Model A car on concrete for two years and did not jack the wheels off of the floor. I did notice that the tires were 'stuck' to the floor upon moving the car last year. There were brown spots on the floor where the tires sat for the two years.
I am not sure the "oils getting sucked out of the rubber" is too great of a concern to me. But I did notice the tires' treads were imprinted with the 'texture' of the 'smoother finish' of the concrete floor.
My biggest concern now is how the tires will wear, now that they have these permanent "scars" on their treads from the concrete. Over time the tires will wear the scars off, ....but maybe the scars will accelerate abmnormal wear too.....? Who knows? Who cares, too late now!
When you get new tires on your car or bike, the treads should be "broken in" by driving at slower speeds for a period of time untill the treads have time to "break-in" establish a wear pattern that will supposedly maximize tire tread life.
I do agree that jacking the wheels off the floor for long storage is a good idea, even though I'm too lazy to practice the habit myself...
Rough concrete or gravel is disastrous to store vehicle tires on, as I have seen it leave very bad permanent scars on tires on vehicles stored for several months with their weight on the tires!
That's where jacking it up is important.
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...Coug
