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I pumped up a Basketball to 60 PSI, at about 55 it started making crackling noises, when I got to 60 PSI the crackling noise was constant and within 2 seconds of reaching 60 PSI the ball exploded. The ball was a Wilson Optima Rubber Basketball .
For NBA regulation basketballs, the requirement is between 7.5 and 8.5 psi. Your basketball may vary, and if it does, the packaging should state how much psi should be used.
Source:
http://www.livestrong.com/article/84284-basketball-official-size-weight/
According to NBA Rule 1, Section B, Article 6a:
" The ball shall be an officially approved NBA ball between 7 1 /2 and 8 1 /2 pounds pressure. "
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