Wheel bearings this go-round?
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I'd say inspect... If they turn firmly but smoothly they are fine. Although, if you continue to run the bearings, popping out the seal and repacking with fresh grease is a good idea.
The main reason for premature bearing failures is improper installation. The first bearing is pressed in until it bottoms in the hub. The second bearing is then pressed in only far enough to eliminate the clearance between the bearings and the bearing spacer. If the second bearing is pressed in too tightly (too far), the bearing(s) will have too much side load on the outboard side of the outer race and the inboard side of the inner race. If it is not pressed in far enough the side loads are opposite once the axle torque is applied. These excessive side loads will wear out the bearings prematurely.
The correct bearing depth is when the spacer is snug between the bearings. It should take very firm finger pressure to move the spacer. If you can easily move the spacer using finger pressure, then the bearing is not pressed in far enough. If you can't move it at all with firm finger pressure, then the bearing is pressed in too far.
I've got over 240,000 miles on the bikes listed in my signature (100,000+ on one of them) without a single bearing failure.
The main reason for premature bearing failures is improper installation. The first bearing is pressed in until it bottoms in the hub. The second bearing is then pressed in only far enough to eliminate the clearance between the bearings and the bearing spacer. If the second bearing is pressed in too tightly (too far), the bearing(s) will have too much side load on the outboard side of the outer race and the inboard side of the inner race. If it is not pressed in far enough the side loads are opposite once the axle torque is applied. These excessive side loads will wear out the bearings prematurely.
The correct bearing depth is when the spacer is snug between the bearings. It should take very firm finger pressure to move the spacer. If you can easily move the spacer using finger pressure, then the bearing is not pressed in far enough. If you can't move it at all with firm finger pressure, then the bearing is pressed in too far.
I've got over 240,000 miles on the bikes listed in my signature (100,000+ on one of them) without a single bearing failure.
Last edited by 2black1s; 08-23-2021 at 10:25 PM.
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