Today marks the end of a three-month trial of courtesy helmets with CityCycle bicycles.

About 400 bright yellow courtesy helmets were deployed with bikes across the City as part of a seven-point plan to boost user numbers in August.

Brisbane's Lord Mayor Graham Quirk said the bike hire scheme was an "evolution not a revolution".

"There was always going to be an opportunity to enhance the scheme," he said.

It is compulsory to wear a helmet while riding a bicycle in Queensland.

A report will be compiled to assess whether they were effective in attracting more subscribers and to determine how many of the $10 helmets were lost.

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Originally published as Free CityCycle helmet trial rolled up