Hire bikes are offered by a range of private companies that collectively have millions of bikes throughout the cities of China. Bike rentals cost 1-2RMB an hour with a deposit of roughly 200RMB when you join the app. Effectively you could join one company and have access to bikes in every city you visit. You just find a bike on the pavement, scan it’s QR code, it unlocks and you’re off on your adventure. The great benefit of these companies too is that you can leave them anywhere just by locking the bike to stop the service.