We are a professional and high-quality motorcycle bearings manufacturer, located in Chongqing, (the China Motorcycle base). These products are produced in strict accordance with QC/T234--1997 Technical Criterion. The materials of the steering top and bottom cone races are adopted GCr15 steel. Advanced heat treatment processing way assures the hardness of its HRC57—62. The planes, outside surfaces, inner diameters and raceway grooves of the steering cone races are processed by using grinding technology, which make the quality and appearance function of products improvement greatly. Therefore, it can perfectly match with CGr15 steel ball and the ball races, which assure the durability and smooth running of products.