The 1 2 speed rear wheel from brompton is a 28 hole 2 speed compatible rear wheel with a double walled rim and a shimano splined style hub this wheel can be used with both your single speed brompton as well as your 2 speed brompton as long as you have a derailleur all you will need to do is choose the correct sprocket and spacer set you need the wheel comes supplied with rim tape only and you will have to either buy a new set of bolts separately or use your old ones