Monkey bikes seized and crushed in Vic

Illegal and unsafe mini-motorbikes are being seized and crushed at the rate of almost one a day after a consumer safety blitz in Victoria.

Almost 200 of the so-called monkey bikes, which can reach speeds of 80km/h, have been removed from sale in Victoria since October after failing safety standards.

A dozen unsafe bikes were destroyed at a steel recyclers in Reservoir on Wednesday in front of the media.

"Their steering is faulty, the brakes don't work and bits are known to fly off," Victorian Consumer Affairs Minister Jane Garrett told reporters.

Three suppliers are now under active investigation and face fines of up to $1.1 million, Ms Garrett revealed.

Mini-motorbikes are illegal on Victorian public roads but can be used on private property and at motorcycle riding clubs.

Children under 15 make up half of all mini-motorbike-related injuries over the three years to July 2015, Monash University data shows.

"They have the potential to harm people just as much as a larger, registered bike and can still inflict serious injuries or even death," Victoria Police Senior Sergeant John Papas said.

Wednesday's public crushing came a day after the premier admitted he was surprised a Melbourne teen charged with fatally hitting a mother with his mini-motorbike wasn't jailed after again breaching his strict bail conditions.

A Melbourne magistrate on Monday ruled Caleb Jakobsson, 19, should remain free but with additional restrictions in place.

Daniel Andrews, when asked if he was surprised by the decision, on Tuesday told 3AW: "That would be a fair comment, yes."