Queensland's helmet laws should be relaxed to make protective headwear optional for "low-risk cycling", Brisbane's deputy mayor says.

Adrian Schrinner took to Twitter this morning to raise his concerns, questioning why it was mandatory for all cyclists to wear helmets.

He said people undertaking "low-risk cycling", such as using Brisbane's CityCycle bikes, should not be made to wear them.

"Seat belts save lives, but they aren't mandatory for passengers on council buses? Why are helmets mandatory for low risk types of cycling?" he said.

Cr Schrinner said the state's laws should be reviewed urgently:

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Cr Schrinner raised the same issue at the end of June, engaging in a war of words with Transport Minister Mark Bailey on Twitter.

Today's response to the question "Should bike helmet laws be relaxed in Queensland?" on ABC Brisbane's Facebook page was varying:

Dino Longo: Helmets are for squares

Helmets are for squares Debra McBride: Definitely do not relax laws. High or low speed incidents can still have significant consequences.

Definitely do not relax laws. High or low speed incidents can still have significant consequences. Richard Savage: Helmets for all or none

Helmets for all or none Genevieve Robey: Yes relax the laws! Encourage more bike use! I'll still wear mine about 80% of the time, but not when I'm just going to my local park which involves passing very little traffic. I'm more concerned about wearing a hat to keep the sun off me.

Yes relax the laws! Encourage more bike use! I'll still wear mine about 80% of the time, but not when I'm just going to my local park which involves passing very little traffic. I'm more concerned about wearing a hat to keep the sun off me. Valerie Jones: You can fall off and bang your head and become brain injured at any time, any speed, any place. Helmets are a must. Doctors fought long and had to get compulsory helmet laws. Please don't undo them.

You can fall off and bang your head and become brain injured at any time, any speed, any place. Helmets are a must. Doctors fought long and had to get compulsory helmet laws. Please don't undo them. Richard Lawton: NO! they are a safety device like seat belts. We have to wear them on the road as accidents happen. Just because a bike is going slow does not mean the other impacting vehicle was.

Others wanted to see helmets optional for those over a certain age:

Peter Solas: Mandatory for kids under 16 and a choice for others. It would help to 'normalise' cycling as more people may be inclined to take it up as a transport option. This MAY reduce the agro around the us and them of cyclist v motorist. I said MAY...

Mandatory for kids under 16 and a choice for others. It would help to 'normalise' cycling as more people may be inclined to take it up as a transport option. This MAY reduce the agro around the us and them of cyclist v motorist. I said MAY... Mc Dave: Compulsory for under 18. Optional for adults. Or bubble wrap everyone and ban everything that's fun or risky.

Cyclists caught not wearing a helmet can be fined $126 under Queensland law.

Last year, a University of New South Wales study showed helmets reduced fatal head injuries by about 65 per cent.