Make sure your tires are clean and dry when they go into storage. Residual dirt, dust or debris can damage your tire or hide potential problems when you place them back on your vehicle. To keep your tires clean throughout their storage, use a tire cover. Most covers include a handle, which makes it easy to shift your tires from one location to another and will help prevent them from being damaged during disuse.
Tires without rims should be stored upright, in a tire rack if possible, and rotated monthly to prevent deformities. Tires with rims should be stored on their sides, on a tire stand if possible, and should also be rotated monthly.
You can store inflated tires, so long as they are only inflated to 50% of the recommended psi. Be sure to re-inflate the tires prior to mounting them back on your vehicle otherwise you will risk damaging the rubber.
Stored tires should be kept in a cool, dark area that is well-ventilated and protected from hazards and elements that can degrade the rubber. Avoid placing your tires in areas that are prone to direct sunlight or near sources of heat. Keep stored tires away from solvents, fuels, lubricants, chemicals and anything that may emit ozone.
Before reinstalling your tires, make sure you give them a thorough examination for damage, cracks and splits on the exterior rubber. If the structural integrity appears sound, ensure you check for debris or moisture along the interior before installation.