Brompton is a brand of these super nifty British bikes that fold up into something about the size of, say, five Homeslice pizza boxes. Their whole bit is how compact, convenient and healthy they are for city commuters. This shop exclusively stocks Bromptons for 10-20k, as well as accessories. Nice perk: repairs are free China-wide (they have another shop in Beijing). Downside is that you can't take them on the Shanghai metro except in a carry bag.