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Old 2019-08-02, 11:18 PM   #31
caseytronic
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Pad Orientation to Reduce Squealing

I realize this reply is about 10 years too late, but I recently found this thread useful in trying to solve squealing on my rim-braked G29.

I started with an anodized Surly Rabbit hole rim (a great modern tubeless comaptible rim that is rim brake compatible) and a Triton triple frame with a magura rim brake.

Build Details here:
http://www.unicyclist.com/forums/sho...81914&page=155

Squealing was so bad I could feel the vibrations in the seat.

Sanding the anodization off of the rim, and sanding the pads slightly (suggested in this thread) reduced the squealing a lot, but not completely.

After much trial, error, and bitter cursing I stumbled upon a solution to the squealing - pad orientation.

I found that if the pads were perfectly parallel to the rim at center of the pad then the squealing would stop.

In other words, If the pads were angled so that the front was even slightly higher up the rim than the back (or back higher than the front) the pads would squeal.

Hopefully this will help any of you rim brake hold-outs still out there.
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Old 2019-08-07, 10:00 PM   #32
MuniAddict
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If your wheel is true, remove and inspect your brake pads, and replace if significantly worn. Otherwise, if they are slick or have some uneven wear, use a sanding block with 100-120 grit to even/level out, and remove any shine, then remove any residue with rubbing alcohol. Reinstall pads and toe them in slightly, in direction of travel. Clean rim sidewalls with rubbing alcohol. Works for me.
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Last edited by MuniAddict; 2019-08-07 at 10:05 PM.
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Old 2019-08-08, 02:52 AM   #33
caseytronic
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I also found that one of my Magura clamps was a tad loose, which also contributed the vibrations and squealing.

I appreciate the good brake pad advice above. I agree that this is the most obvious cause of squeal. I forgot to mention that I had already cleaned and sanded the rim and pads before taking the other measures in my posts.

I know toe-ing in the pads works well for typical rim brakes, but I've heard conflicting advice as to whether it works for the Magura hydro rim brakes. Ill have to experiment with this a little sometime.
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