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05-07-02, 12:56 PM
I've posted this question on a couple of other boards and haven't had much success with ideas or opinions. Before I dive right into the problem I think I've got it figured out I just need a second opinion or if anyone else has another, better idea lets have it!
I'm currently running a set of Kona 3 piece Cro Mo cranks on one of my bikes. Recently over the last few months since installation the suckers have tightened up on thier own, meaning the preload on the bearing or bearings has increased making them bind. Now I've taken them apart a couple times and eventually traced the problem to a single spacer I'm running on the non-drive side. The spacer fit inside the bearing cup pretty snug against the bearing race. Meaning that the spacer would sit inside the cup and not move at all, while the bearing, and axle would turn. My guess is that the spacer would somehow with friction, get caught and twist itself inward onto the bearing race.
So here is my theory. I've taken out the spacer and filed and sanded the bejeezus out of the outer diameter so that is fit inside the bearing cup sans resistance. It seemed to move freely inside the bearing cup from there on so I figured problem solved. I put everything back together and observed how everything seemed to work fine.
Not quite I guess. It happened again yesterday. I looked down at the cranks and noticed that the spacer was not spinning again. So I'm gonna take another stab at it and file some more off the spacer and hope that, that is the end of my auto-preloading problem.
Any other opinions would be greatly appreciated. Thanks.
Shane
I'm currently running a set of Kona 3 piece Cro Mo cranks on one of my bikes. Recently over the last few months since installation the suckers have tightened up on thier own, meaning the preload on the bearing or bearings has increased making them bind. Now I've taken them apart a couple times and eventually traced the problem to a single spacer I'm running on the non-drive side. The spacer fit inside the bearing cup pretty snug against the bearing race. Meaning that the spacer would sit inside the cup and not move at all, while the bearing, and axle would turn. My guess is that the spacer would somehow with friction, get caught and twist itself inward onto the bearing race.
So here is my theory. I've taken out the spacer and filed and sanded the bejeezus out of the outer diameter so that is fit inside the bearing cup sans resistance. It seemed to move freely inside the bearing cup from there on so I figured problem solved. I put everything back together and observed how everything seemed to work fine.
Not quite I guess. It happened again yesterday. I looked down at the cranks and noticed that the spacer was not spinning again. So I'm gonna take another stab at it and file some more off the spacer and hope that, that is the end of my auto-preloading problem.
Any other opinions would be greatly appreciated. Thanks.
Shane