“Iron” Mike Tyson does good-by accident victim in need.

Boxing Legend Mike Tyson took action recently, after witnessing a taxi cab collide with a motorcycle rider.

TMZ has the scoop:

Ryan Chesley tells TMZ … he was on his way to Las Vegas this week when a cab cut him off on the freeway … sending him flying off his chopper.

Chesley says Tyson saw the whole thing … slammed on his brakes and stopped traffic. Chesley says Tyson — mindful the victim might be in shock — kept him calm until paramedics arrived.

– Photo released by attorney Stephen Stubbs, via Kansascity.com