The bicycle multiple freewheel first appeared on the market that the cassette and the fixing system is different. The reel is to be used on threaded wheel hubs that are normally 34.8mm in diameter. In addition to the multiples that can vary between 3 to 9 gears, also in this category you can find free and fixed wheels for single speed transmissions. On the fixed and single freewheel, we have numerous combinations of teeth so you can choose your best option. The bmx bicycle transmissions were not and their wheels were free with a small number of teeth as well as their thread diameter of 30mm. For fixie, single speed and bmx bikes, here you will certainly find what you are looking for.