Giant has a vast, sprawling network of franchises in Shanghai, and they vary wildly in size and quality of service, but they all stock Giant bikes. This one, near Zhongshan Park, is the best one we know about. They stock bikes in all shapes, sizes and configurations, including folders, e-bikes and kid bikes. They mostly sell nice road bikes in the 10k-60k range, and the more expensive ones are seriously high spec. More entry-level models go for between 4-7k. They'll repair any bike, too. Replacing your brakes will cost 50-100rmb. They organize a road bike competition every year, but you have to have a Giant bike to get involved.