Some cyclists dressed up for the occasion, with a two people in Tiger onesies spotted.
The Associate Minister of Transport Julie Anne Genter was among the riders, accompanied by Bike Auckland's Barbara Cuthbert and Teau Aiturau and his Triple Teez team from Māngere.
"Over the last five years Teau Aiturau and his team have rehabilitated hundreds of bicycles and empowered thousands of children and adults with the skills to ride and fix bikes," said Genter.
"The Bike the Bridge event is a great reminder of how Auckland's Harbour and city can come alive when we make room for people.
"Cycling across the Harbour Bridge is always incredibly fun. I'm looking forward to having a cycle path across the bridge in the future so we can do this every day."
Meanwhile Generation Zero kicked of their own cycle tour, starting from with the Bike the Bridge event, and ending in Wellington.
The cycle tour is the first of a number of initiatives that Generation Zero has planned before the start of the Government's official consultation on the Zero Carbon Bill in May.
Their five-person cycle crew will take 12 days to cycle down the north island, stopping for conversations about climate change along the way.
They will be welcomed by a large crowd of supporters on Parliament lawn when they arrive down in Wellington on March 1.
"We're braving the elements and biking through the likely path of ex-cyclone Gita to highlight the fact that climate change is here and we need to act now," said Zero Carbon Act spokesman James Young-Drew.
"The Zero Carbon Act is vital to safeguard our climate, not just for the future but for today. We are launching our tour at "Bike the Bridge" to show that while the problem is global, local communities can come together and push for solutions."
"Over the next few months we will talk with communities all over Aotearoa, New Zealand because all of us need to work together to guarantee a safe climate, for us and those coming after us. We want everyone to be involved in generating solutions for the climate and environmental problems we are facing today, that's the only way we will succeed."
