FRENCH freerider Kilian Bron has tackled some of the most death-defying, off-the-beaten tracks on his mountain bike, but his latest stunt at the Mundaring Weir has landed him on the wrong side of the law.

Pictures have emerged on Bron’s Facebook page of him riding down the wall of the Mundaring Weir during his visit to the Perth Hills.

A Water Corporation spokeswoman said the matter had been referred to WA Police.

Camera Icon Kilian Bron riding down the walls of the Mundaring Weir last month. Credit: Supplied / Supplied

“Not only is this act illegal, it is extremely dangerous and stupid,” she said,

“At around 40 metres, the wall is very high.

“While it is unlikely to cause any damage to the wall itself, trespassing onto the wall would be an extreme risk to personal safety.”

The spokeswoman said safety barriers and warning signs are in place because the dam is an important drinking water source for people living in communities from Mundaring to Kalgoorlie.

Camera Icon Bron riding in Kalamunda, home to the Munda Biddi, one of the world’s longest dedicated off-road cycling tracks. Credit: Supplied / Supplied

“To help ensure our drinking water at the source is protected, it is vital the public work with us by staying out of restricted areas of the dam, and not climb walls, fences, pipework or other operational infrastructure,” she said.

Bron has been contacted for comment.

WA Police declined to comment.

Freeride is a discipline of mountain biking closely related to downhill biking and dirt jumping focused on tricks, style, and technical trail features.