I have a set of 31" tires on 15" xj wheels...sitting in my backyard...brand new!!! However the new jeep i bought i must pay off before i lift it...so the 31's must wait for about a year before i get to mount them. If i leave them in the back yard all year (CT) cold in the winter and hot in the summer...dont i have to worry about the rubber starting to crack? Any ideas welcome. thanks.