What is the best way to store tires and rims?

I don't know if this is the best way, but I have an original Polyglass tire (my spare), from 1971. I never used Armorall on it or any other tire cleaner...

I simply put a light coat of Petroleum gelly (vaseline) on it every 2-3 years, and it still holds air, I haven't added air to it in probably 5-6 years and holding at 28psi.
That baby is full of fresh '70's air, less polluted, but possibly herb scented,lol.

On the car, I have 2 Good Year Eagle ST's on the front, they date back at least 15 years or more. They are slowly starting to vent or crack, along the rim diameter. I think this is due to using Armorall, and then sit in the sun.

And taking the wheels off is a good piece of advice.

All the best!
Giles