Tire compounds are formulated to resist deterioration caused e.g. by sunlight, humidity and ozone. Nevertheless, stored tires should be protected against these and other potentially damaging conditions. The longer the storage period, the more exposure there is to potential damage.
Preferred positions are shown below:
If possible, store the vehicle on the main stand or on a motorcycle jack to remove all weight from the tires and cover the tires to protect them from environmental exposure.
If the vehicle cannot be lifted from the storage surface, completely unload the vehicle, so minimum weight will rest on the tires. The storage surface should be firm, reasonably level, well drained and clean.
In cases where the tires will be supporting the vehicle, it is permissible to inflate the tires to the maximum pressure listed on the sidewall. Be sure to return the inflation pressure to recommended usage pressure before operating the vehicle.
In cases where the tires will be supporting the vehicle, it is recommended that the vehicle be moved every month to minimize ozone cracking in the contact area and also to minimize a "flat spot" from developing. If the tires do develop "flat spots," they will usually disappear in a short period of service.