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FJR Motorcycle Forums
Technical & Mechanical Problems
Front Wheel Bearings
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<blockquote data-quote="Fred W" data-source="post: 1423167" data-attributes="member: 3828"><p>The reason the internal spacer matters is because the wheels hub sets the distance between the outside races of the two bearings. The inside spacer will set the distance between the two inside races. If the inner and outer races of the bearings are misaligned there will be constant lateral force on those bearings. The idea is for them to be aligned so the balls have the designed tolerances.</p><p></p><p>Note that it could be a combination of the inner races being pinched in and the outer races being not fully seated in the hub. That was what I was initially thinking was the problem since the spacer is nearly the correct length. A little dirt or build-up on the surface would be significant. But his started doing it from new, so maybe there is a lip in the bore in the hub preventing the bearing from seating correctly?</p><p></p><p>The reason the spacer is free to move is the inner race can move laterally. If the spacer was the correct length it would not be snug in between the bearings or else it would be too long.</p><p></p><p>Also, I agree the measurements are wrong. I think he meant cm not mm? Ive never measured the internal spacer but I know its more than 4mm long.</p></blockquote><p></p>
[QUOTE="Fred W, post: 1423167, member: 3828"] The reason the internal spacer matters is because the wheels hub sets the distance between the outside races of the two bearings. The inside spacer will set the distance between the two inside races. If the inner and outer races of the bearings are misaligned there will be constant lateral force on those bearings. The idea is for them to be aligned so the balls have the designed tolerances. Note that it could be a combination of the inner races being pinched in and the outer races being not fully seated in the hub. That was what I was initially thinking was the problem since the spacer is nearly the correct length. A little dirt or build-up on the surface would be significant. But his started doing it from new, so maybe there is a lip in the bore in the hub preventing the bearing from seating correctly? The reason the spacer is free to move is the inner race can move laterally. If the spacer was the correct length it would not be snug in between the bearings or else it would be too long. Also, I agree the measurements are wrong. I think he meant cm not mm? Ive never measured the internal spacer but I know its more than 4mm long. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Front Wheel Bearings
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