J.R. Smith -- Scooter Frenzy ... NBA Exposure Created Bigger Boom Than Bieber

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Bieber has one ... so does Jamie Foxx and Chris Brown -- but the guy who ignited the biggest sales boom of those new 2-wheeled scooters is Cavs star J.R. Smith ... TMZ Sports has learned.  It's called the PhunkeeDuck -- a foot-controlled…


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