A HEARTBROKEN dad has begged parents to check their kids' bikes before it's too late - after his six-year-old son was killed by a jagged handlebar.

Tragic Denny Curran died in hospital after the "serrated" tube pierced his chest with enough force to rip a vital artery in two.

The horrific accident happened as he rode with friends near his old home in Pullman, Washington.

Dad Keith told of the moment he realised his son had been fatally injured - and revealed his wife "collapsed" when she heard the news.

He told KDNU: "My wife had collapsed and handed me the phone.

"For some reason and I don’t know yet, the bicycle handlebars turned 90 degrees and impacted the asphalt and impaled him in his abdomen"

"He tore his iliac artery and lacerated his abdomen.

"He stopped breathing and CPR was performed. They had to clamp off the artery.

"This bicycle’s handlebar tubes, they are these tubes and they have some serration on the end of them.

"And through normal operation of bike it saws off the rubber on the grips and they poke through.

"I looked at the bicycle afterwards and I see that the grip had been moved forward.

"I don’t know if that was from the impact of his body hitting it or if that was from operational use."

Curran is now urging other parents to keep a close eye on the handlebars on their children’s bikes, to make sure the tragedy is not repeated.