What city has a lot of bikes?

I'm curious, which city in the world boasts an abundance of bicycles? Is it a metropolis known for its eco-friendly initiatives, or perhaps a city with a rich cycling culture that has embraced the two-wheeled mode of transportation as a way of life? I'm intrigued to know which urban center stands out as a haven for cyclists, where the streets are lined with bikes of all shapes and sizes, and where the hum of bike wheels can be heard echoing through the cityscape.