Seven police cars were sent to a quiet park in Sydney to catch riders without helmets.
On Saturday, cyclists protested against Australia's mandatory helmet-wearing laws, while police told cyclists in Sydney's Centennial Park that they "will enforce the law", the Daily Mail reported.
But their approach was strongly opposed by bike groups, some calling Sydney "the most unfriendly city in the developed world to ride".
One group said the new fines were aimed at "trivial crimes" and groups across Australia were protesting on bicycles.
Seven police cars were sent to catch cyclists in Sydney's Centennial Park on Saturday afternoon riding without a helmet during a peaceful protest
Court documents revealed by the Daily Mail showed, Chris Standen pleaded guilty to not wearing a helmet while riding, but on Monday, a magistrate at Sydney's CBD Tang Ning Central District Court dismissed the charges against him.
"this (Monday) morning, the court dismissed the 330 yuan fine I incurred for slowly and carefully riding my bike in a sunshade cap," he wrote on Twitter. "minor crimes, no objective risks, good character, etc. What a waste of police / court (and me) time. "
Officers told cyclists they 'would enforce the law' as riders protested against Australia's helmet laws
After the charges were dismissed, Standen said it was a waste of time and something that would only happen in Australia.
It is understood that Standen was stopped and fined with a sunshade hat and a doctor's letter supporting his choice.
It is understood that the case had nothing to do with the biking protests over the weekend.
The approach shown by NSW Police has led to a fierce backlash from cycling groups and supporters
Protest groups say the case currently before the courts is one of the reasons for protests across Australia. There were protests in Melbourne, Adelaide and Brisbane.
Standen took part in Saturday's protests, accusing the new state of policing too much.
Groups said cases currently before the courts was a reason for the protests held throughout Australia
The cyclists said they felt they were being watched by the police. The police stayed at the scene for about two hours.
Freestyle Cyclists Secretary Francis (Kathy Francis) says the new state police have taken punitive action against cyclists. "it is disappointing that the new state police are unable to deal with this situation in a more constructive way."
She said that from the history of other interstate new states, good policing can promote safe protests in the community, and good relations between the police and the public can be formed.
Saturday's incident in the park was also described as a police public relations disaster.
Chris Standen was due in court anyway on Monday but had his case thrown out despite pleading guilty
Last year, the new state road director, Gay (Duncan Gay), issued new rules, imposing a 330yuan fine on people who don't wear helmets on bicycles.
Protesters say the congestion problem is growing and the government should encourage cycling, but cyclists face high fines for normal things.
Francis said the new state has fewer cyclists, a poor safety record and is considered the least friendly to cyclists in the developed world, compared with the rest of the country.
A video shared by Freestyle Cyclists on his Facebook page showed a policeman telling cyclists that they would enforce the law.
Then a policeman stopped a woman and told her that she would be given a ticket.
The woman replied that the new regulations made cyclists more dangerous because drivers were no longer "sharing the road."
Section 256 of the new cycling code requires cyclists to wear Australian-standard bicycle helmets and wear them well. After the new rules were issued, the penalty for non-compliance was raised from 71 yuan to 319 yuan.