If you're building a rental skate inventory for the first time, it's wise to consider a population study of the surrounding area that the rink will serve. If replacing your existing inventory, you may already have useful customer data that will prove helpful when placing your order.
The best way to determine skate model choices and quantities is to look closely at the skating programs offered at your rink. Do you offer open ice time? How many hours per day/week? Do you offer a skating school? Is there a "learn to skate" program? How about a "learn to play hockey" program for youths and adults? Is there an in-house figure skating club? How many people are normally reigstered in your skating classes? How many new skating lesson signups do you receive annually? Do you offer skating times for daycare facilities, civic organizations or church groups? What is your rink's size, location and purpose?