It is a development product of Korean startup all-to-bike. The development of this product is being completed. From now on, I will upload videos about the product constantly. This product can be manufactured at 6,8,9,12,15 speeds. Bicycle internal transmission is practical, but lacks function or is too expensive. Therefore, we are developing a product that is cheap and has good performance. Although it can be manufactured by cutting processing, it will be produced by producing parts through powder metallurgy or mim. This product was developed for sale at the price of a typical bicycle transmission level.