Attention! Due to the size of the tires Packages might be SEPARATED in the courier facility and not be DELIVERED on the SAME DAY even though we do ship them together. Tracking information can be checked by logging on to the courier website with the master tracking number you will receive via email. For example you can receive 3 tires in one day and the 4th one the next day or the day after or one tire in one day and the second one day after. We understand that this is a big inconvenience for our buyers however this is ABSOLUTELY out of our control. Manufacturers recommend changing tires every 10 years. As long as tires are properly stored before they are sold the year of their manufacture will not shorten their service life.