The city's bike share program became available on Sunday to users with weekly or daily memberships.
The Citi Bike program launched on Memorial Day, but only to riders with annual memberships.
About 6,000 bikes are available at more than 300 stations in parts of Manhattan and Brooklyn, with more stations expected to be added.
Some cyclists were happy to hit the streets of the Flatiron District on Citi Bikes on Sunday morning.
"It's nice because you're kind of separated from the traffic in a lot of the places, so it felt safe. We were a little bit nervous at first thinking we were going to be right out there with a lot of the traffic, but it's not that bad," said one rider.
"Being tourists, this is a great way to see the city. And I think coming out early in the morning it's safe as well," said another.
At least one rider, though, told NY1 that the Citi Bike kiosk did not accept his credit card.
Organizers marked the full launch at a docking station on the northern end of Union Square on Sunday afternoon, and Department Of Transportation employees gave away 500 helmets.