A group of more than 50 motorcyclists rode to the Royal Courts of Justice to challenge to the legality of a parking fee introduced in central London, costing £1 every day.
Leaders of the "No To Bike Parking Tax" campaign are protesting over the charge introduced by Westminster City Council for motorbikes, and are asking judges to rule that they are unlawful.
The campaign chairman, Warren Djanogly, says the council is acting outside its powers. He also claims the orders are invalid because they have no traffic management benefit.
Surrounded by bikers outside the law courts in The Strand, Mr Djanogly said: "Westminster councillors are blatantly abusing the system to raise money, and we are going to expose them.
"No other council charges bikes to park in this way.
"We have support from all over Europe. People everywhere are telling us we have got to stand up.
"We must not capitulate because every council round the country is desperate to bring in similar charges."
According to 47-year-old management consultant Mr Djanogly, who rides a Yamaha 1300 Midnight Star, the appeal against the £1 charge was costing £70,000 and being met by donations from more than 700 individuals.
© Press Association 2010