4Pcs SMR18307-2RS Ball Bearing 18 * 30 * 7mm ABEC-3 Stainless Steel Double Sealed 18307RS Bicycle Bearings for Bottom Brackets

Magnetic BearingsBearing18x30x7 mm Stainless Steel Balls Rubber Sealed [4Pcs]The bicycle is a beautiful thing - art and performance wrapped up in an awesome package.But they do not roll without the bearings.You can not steer, roll, or pedal without them.So show some love, and keep them rolling smoothly by knowing more about your bike from front to back.If your rotating components are not smooth, have a look inside to see what you can do for better performance.* Fit Perfectly - Mounted on a 16mm shaft.* Roll Smoothly & Without BacklashStructures Designed For BicyclesGreaseThey are characterized by excellent water resistance and loadcarrying properties and help provide longterm protection against rust and corrosionBearing Installation and RemovalBearings should never be installed by pressing on the inner raceAlways press on the outer race with a pilot bushing or similar tool, which will only make contact with the metal side of the outer race.A bearing press or similar should be used to exert the force needed to press the bearing into the housing.Ensure that the seating surface is clean and free from rough edges so that they fit true and square.Quite often bearings can feel fine before fitting, but then feel "notchy" or "rough" after fitting. This is almost always due to the bearings not sitting square and true.Care needs to be taken that the bearing is started straight and not at an angle to the housing. Bearing CareTo prolong the life of your bearings, do not direct a high jet of water near areas of your bike where there bearings are located - an ingress of water can lead to premature bearing failure.The material of this bearing is 52100 Chrome steel, Not waterproof.

• Magnetic Bearings