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

BearingsThe 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.DETAILS18307RS Bicycle BearingsDimensions: 18 x 30 x 7 mmRing Material: Stainless steelBall Material: Stainless steelLubrication: Pre-GreaseShaft Mount Type: Press FitTemperature Range: -20° to 120 ℃ABEC Rating: ABEC-3Weight (grams): 26.82Quantity: 1 Lot = 4 PcsGreaseThey are characterized by excellent water resistance and load-carrying properties and help provide long-term protection against rust.Bearing Installation and RemovalBearings should never be installed by pressing on the inner race.Always 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.

• Bearings
• 4Pcs 18x30x7mm Stainless Steel Balls Rubber Sealed
• Fit Perfectly - Mounted on a 16mm shaft.
• Roll Smoothly and Without Backlash.
• Structures Designed For Bicycles.
• The material of this bearing is 52100 Chrome steel Not waterproof.