Maybe a silly question but,

I have a set of Stock tires mounted on wheels and since they are going to be sitting for at least 9-12 months, will it hurt to leave them fully inflated on the wheel or should I deflate them/or take them off the wheel completely ?

Thanks!

 

I'd leave them on the wheels and put them in sealed hefty bags. Store away from any source of ozone (fan motors, etc)