10pcs 4mm ball bearings for MTB bikes, front fork, steering gear, bicycle bearing cap - ShopVlot

Box contents: 10 x 4 mm ball crank bearings x 20 balls. High-quality material: This bicycle bearing is made of high quality steel, non-slip and durable. Size: each bearing has 20 balls, the diameter of each ball is about 3.35 mm and the outer diameter of the bearing is about 40 mm. Ball bearing steering sets are precision cage bearings. Easy to carry: the bike bearings are very light and easy to carry, and the packaged bicycle accessories can be replaced at any time. Wide range of uses: this bic