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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 04-05-13, 03:16 PM   #1
Shp4man
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Are some MTB wheels more prone to brake squeek than others?

I found a nice MTB on Craigslist recently, and to get it rideable, I took the wheels off my other MTB, replaced the brake pads front and rear, and went for a nice ride. No brake noise.
Then after replacing the tires on the bikes original rims, I put them on. Holy crap! The brake noise was bad, from both wheels.
I alcohol cleaned the rims, set the brakes with a little nose in attitude and tried it again. Better, but still noisy. What am I missing here?
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Old 04-05-13, 04:44 PM   #2
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You can 'scuff' up the rims slightly with something like a kitchen scouring pad, also try cleaning the brake track afterwards with something like alcohol or naptha and see if that helps.

Sometimes it can just be the frequency at which the combination wheel, fork and/or frame tends to vibrate at under braking.

A fork-mounted cable hanger can help stop brake noise (& shudder) for some kinds of cantis.

What type of bike/brakes/pads is it running at the moment - did you use decent, new replacement pads like Kool Stops or Ashimas?
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Old 04-05-13, 06:11 PM   #3
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There are lots of variables that can cause squeal. Since your squeal syarted after a tire change, odds are you transferred some oil, or soap or whatever to the rim while changing the tires. If you do absolutely nothing, the squeal will likely resolve soon enough.

Of IME acetone (the real stuff from the hardware store, not nail polish remove) does a better job stripping films off rims that most other products.

You might also remove the wheel and use the acetone to clean the shoe's surface.

For reference, my commuter's brakes squeal when the weather changes, the next day after riding in the rain, or sometimes on whim, but it usually resolves by the time I finish the 6 mile one way trip.
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Old 04-05-13, 08:21 PM   #4
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Thanks for the responses! I played around with it after work today and ended up lightly sanding the pads and rim braking surface, then recleaned and adjusted everything. It's way better, and thanks for the tips! The pads are inexpensive Jagwires. The bike has cantis in the rear and a Vbrake in the front.
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