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Persistent Rim Rub (19x700c)

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Persistent Rim Rub (19x700c)

Old 12-17-21, 06:10 PM
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zandoval 
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Persistent Rim Rub (19x700c)

I have a spot on my front wheel that is giving me a persistent rub when applying my brakes. I have had problems like on other wheel sets before but was able to alleviate them by tuning the wheel for spoke tension, rim positioning, rim width, and truing, but not this wheel. It measures 19.7mm before and after the seam. The weld looks flawless and even. The spokes do not have abnormal tension from the other spokes. I have checked every thing I can think of and this wheel still gives me that slight rub in seam area when applying the brakes. Is it possible that the rim is changing its shape when I have my weight on it? Maybe the seam has nothing to do with the problem...


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Old 12-17-21, 07:08 PM
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It use to be very common that rim seams would have enough width/surface variation to cause brake pulsing. Some would use medium/fine emery cloth held on a flat block and sand down any high spots of the joint, of course the low spots remain. These days we have far better seam finishing with the entire brake track getting some sort of machining or sanding. So brake pulsing is a far less common complaint.

I would do some fine sanding using a block and see if there's wide high spots of low ones. If high/wider spots then sand away. Of low, live with it. Andy
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Old 12-17-21, 11:02 PM
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Flip the wheel and see of it's better/worse.
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Old 12-18-21, 09:50 AM
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New wheel? Usually the bumps at the rim joint take care of themselves quickly for me in less than 100 miles. Though this appears to be a welded joint, so maybe it won't take care of itself.

I might just take a small flat file and make it smooth or some sandpaper or emery cloth backed up with something hard and flat.
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Old 12-19-21, 04:42 PM
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Originally Posted by Andrew R Stewart View Post
...use medium/fine emery cloth held on a flat block and sand down any high spots of the joint...
Have not tried that yet but the joint looks very clean and even. Mark left from the brake pad is also even. I will give it a try though.

Originally Posted by Bill Kapaun View Post
Flip the wheel and see of it's better/worse.
OK Bill... Flipped the wheel and now the Rub/Pulse is significantly less. Now my big question is WHY?
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Old 12-19-21, 04:48 PM
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The rim joint is obviously misaligned. The "high" side becomes the "low" side when you flip the wheel.
Think of moving the meat the wrong direction on a meat slicer.
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