After hitting a speed bump last year, Citi Bike’s electric bikes, also known as E-bikes, have returned to city streets.

Ten months ago Lyft, the company that owns Citi Bike, pulled its original fleet of E-bikes from the bike-share system because of a breaking problem. The force of the breaks put too much pressure on the front wheel, causing some riders to fly off the bikes. The company has redesigned the bicycles, putting the motor in the back, and redesigned the braking system.

Lyft says these new bikes are safe.

“We are really proud of our safety record at Lyft and it’s a great new product,” said Cory Epstein, a spokesperson for Lyft. “We encourage everyone to go out and ride it.”

Lyft has begun rolling out the new bikes across the city. It plans to make hundreds of them available over the next month and thousands by the fall.

HOW DO THEY WORK?

The motor gives riders an extra boost when they need it, say, riding over a bridge, up an incline, or when a rider is in a hurry.

“The best is when I have to go to Brooklyn and I have to ride over the bridge. That made it way easier ... Those bridges can be steep,” said one E-bike rider.

Lyft says electric bikes are the future of bike share systems, especially in cities like New York where bikes will need to go faster and farther and will need to be easier to ride to become an alternative to cars and the subway.

“They are great,” said another enthusiastic E-bike rider. “Like, I’ll never use the subway again. They’re so wonderful. I can take longer trips. I love them.”

Lyft is investing $100 million to double the bike share system from about 20 thousand bikes to 40 thousand bikes in five years.

The expansion will start in the spring.