The backboard size for your portable basketball hoop will depend on where you plan to put your goal, but generally speaking the larger the better. Backboards in the NBA measure in at 72” which is quite large for a home-court hoop so the next size down is 60” which is still plenty of backboard for the leisurely player. The most common size will be between 48” and 54”. These are great basketball hoops for mobility and storage if you choose to move it inside during colder seasons.