For winter storage no need to remove the wheels/tires and it is not advised one raise the car unless one can lift the car via its tires/wheels which leaves the suspension slightly compressed which is considered best for long term storage.I was doing what I seem to do a lot, searching the internet for ways to spend more money on my car when I stumbled upon these. Has anyone tried them, or even seen them for that matter. Seems like a good trick if you are one of those that wants to take the tires off all winter. Probably cheaper than trying to find a set of cheap rims, my only concern would be if the clear the calipers.
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Just do what the factory does. Inflate the tires to something close to their max recommended pressure which is IIRC 45psi. This is the tire pressure the tires leave the factory with and is suited for storage. New cars often sit some time and this higher pressure helps them resist flat spotting.
Obviously when it is time to resume using the car adjust the tire pressures to what the factory calls for, probably 32psi.