https://www.sumlon.com/bike-part-names/
is a Chinese bike parts manufacturer. We manufacture bottom brackets, one-piece cranks, chainrings and bike headsets. 3 self-owned factories have been in operation for over 15 years in China. Now SUMLON, as a bike parts factory and a bicycle parts wholesaler, is providing you with several kinds of high-quality commonly used bicycle parts and we are expecting more.