Other things to consider: Indoor hazards
Even indoors, there are hazards to keep in mind. As a precaution, be sure to keep an adequate source of extinguishing agent, such as water or carbon dioxide extinguishers and foam additives, in case of an emergency.
Keep tires away from ozone-producing equipment such as arc welding appliances, mercury lamps, electric motors, etc. "Tires can degrade from exposure to ozone," says White. "Ozone is a by-product of arc welding, so if arc welding is done in a shop, it's best that tires not be stored in that area."
Rubber can also absorb vapors from gas or lubricants. This can cause deterioration, so store tires in a dry area away from chemicals, petroleum-based products and oils/fuels. "A tire stored in a pool of solvent will begin to break down, since the rubber compounds on both the tread and sidewall contain some petroleum-based ingredients," says Tim Miller, Goodyear.