It depends on who you are and what you are doing. Basketballs come in several sizes. Using the correct size can help prevent injury.
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The standard size of a basketball used by the National Basketball Association ranges from 29.5 to 29.875 inches. However, non-professional basketballs can be much smaller, depending on the age for which the basketball is intended.
According to NBA rules the basketball will be 29.5 to 30 inches in circumference and have a pressure of 7.5 to 8.5 pounds.
it is 54' but i consider a bigger dick instead if you people know what i mean lol