Paris has got it. The Dutch are nutty for it. In Canada, they can't get enough. You'll find them on the streets of Barcelona, Stockholm, Copenhagen, Helsinki and Dublin. And they're coming to London next month.
Expect to see hundreds of bright blue, Barclays-branded bikes for hire, at 400 hotspots around London. And tons of brand new cycling fans thronging, wobbling, teetering and careering through the streets.
Public bike schemes are taking the world by storm, and it's easy to see why. It's brilliant to explore the city on two wheels, especially when the sun is shining.
London's version is sponsored by Barclays, and with their name on hundreds of bikes across the capital, the unimaginatively named Barclays Cycle Scheme will put the brand at the heart of the city. Great to see the bankers putting a smile on our faces for once.