First orange and green bikes, and now yellow bikes are for rent in Seattle. This month marked the U.S. debut for China-based bike share Ofo.

Ofo (yellow), LimeBike (green) and Spin (orange) are each permitted to have 1,000 bikes in the city. In September, the maximum increases to 2,000 bikes per company. The city will allow the companies to double their stock every month.

Seattle officials watched the city's Pronto program fail earlier this year. So far, though, the new privately-run system is getting good reviews. The private companies do plan for some bikes to be thrown in the bushes, broken or otherwise mistreated. But Derrick Ko, CEO of Spin, says there have been very few issues in Seattle.

"The past month, there are actually more people writing into us, saying, 'I really want this to work, I noticed that there's a damaged bike,'" Ko said. "We were really encouraged and really humbled by the response we received."

Ko says Spin wants to eventually have 10,000 bikes in Seattle, much larger than any of Spin’s other cities, or any bike share Seattle has had.