James Harden -- Wearing Nikes Again?!??? Just Did It.

So much for that "Adidas is about to be crackin'" declaration -- because the shoe company's $200 million man James Harden just stepped out in NYC ... ROCKIN' NIKES ... AGAIN!!!

As we previously reported, Adidas made it clear to Harden last week they were pissed the NBA star was spotted in Air Jordans ... after inking him to a HUGE endorsement contract.

Harden told TMZ Sports he smoothed things over with Adidas ... and even though his contract doesn't go into effect until October 1st ... he was on board and bragged about the company is about to BLOW UP!!

Fast forward to today ... with Harden back in Swoosh kicks.

So, here's how this plays back at Adidas HQ -- "Our poster boy thinks Nike is better ... 'cause he keeps wearing them even though we're paying him $200 MILLION!!!!"

Which begs the question -- who's gettin' fired?!?