A 66-year-old man riding a bicycle, powered by a petrol motor, was clocked travelling more than 30 kilometres over the speed limit along Wendouree Parade.
After police stopped the man on January 14, he was found to have methamphetamine in his system.
The retired spray painter told police he had taken a line of the drug at a party two nights before.
The man, who The Courier has chosen not to name because he was not convicted, pleaded guilty at the Ballarat Magistrates Court on Thursday.
Police prosecutor Leading Senior Constable Sam Young said the man was detected travelling 82km/h in a 50km/h zone on Wendouree Parade.
He said the bike was unregistered and did not comply with safety standards, while his helmet also did not comply with safety standards.
The man told police he did not realise the bike was classed as a motorcycle or that it was unregistered, and he thought he was travelling at 40km/h.
A sample of the man's oral fluid test was analysed and tested on January 18 to be methamphetamine, the court was told.
The man's lawyer said her client bought the bike for $100 from a friend as a cheap means of transport and he was unaware he had to meet safety requirements under the Road Safety Act.
The court was told the man's drug use was recreational and very infrequent.
Magistrate Gregory Robinson said he had noticed children riding the motorised bicycles around the Ballarat CBD this week and questioned whether they knew they were illegal.
In sentencing the man, the magistrate said he accepted the incident was unusual driving.
The man's licence was cancelled and he was disqualified from driving for 12 months. He was also fined $500, without conviction.