Tiers reset after a 12 month period from date of tier entry. Rolling year is a dynamic 12-month period starting when a customer reaches a certain tier. For e.g. when you reach the All-Star tier, you will be eligible to stay in this tier for 12 months unless you move up to the Hall of Famer tier within this period. If you move up to Hall of Famer, the dynamic 12-month period will reset from the date of entry. At the end of this 12 month period you will get a final call to spend your rewards before a reset i.e. re-starting at Rookie.