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Brake touches rim

Old 04-06-12, 04:44 PM
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roborovski007
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Brake touches rim

This problem lies on the front wheel where one side of the brake pad touches the rim (non-braking state) thus causes front wheel not to roll smoothly. Just notice this problem after I did my ride.
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Old 04-06-12, 04:57 PM
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Is the wheel in the fork straight? Is the brake mounted straight? Most brakes have a method for centering them, what kind of brkes do you have? any pics?
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Old 04-06-12, 04:58 PM
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Edit: ^^


is the wheel centered in the fork? what kind of brakes?

http://en.wikipedia.org/wiki/Bicycle_brake

Last edited by IthaDan; 04-06-12 at 05:01 PM.
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Old 04-06-12, 05:03 PM
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Easy fix. Some folks keep their front brake connection to the fork just a little loose so they can readily adjust the brake a little to the left or right as needed. Just grab the brake and move it left or right to stop the drag. If you cannot move the brake, use a 5mm (I think) hex wrench and loosen where the brake connects to the fork.
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Old 04-06-12, 05:04 PM
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roborovski007
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yup, it is centered in the fork. it is a dual pivot side-pull caliper brake.
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Old 04-06-12, 05:08 PM
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is the contact with the rim constant or periodic and related to a certain part of the wheel during its rotation?
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Old 04-06-12, 05:12 PM
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Originally Posted by IthaDan View Post
is the contact with the rim constant or periodic and related to a certain part of the wheel during its rotation?
it is constant.
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Old 04-06-12, 05:22 PM
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Your brake is turned relative to the fork. It might be loose enough to just muscle it back to alignment. If you have a carbon fork ignore what I just said and loosen up the brake (allen keyed nut on the back of the fork), re-allign the caliper and tighten. Or if forcing the issue doesn't work, loosen, align and tighten. You might have to keep pressure (hold the caliper in alignment with your other hand) as you tighten, as calipers have a tendency to dance.
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Old 04-06-12, 05:33 PM
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The usual suspect is the wheel isn't pushed all the way into the dropouts. You should always make sure the bike is on the ground when you tighten the QR. The other possibility is your pads are worn.
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Old 04-06-12, 06:08 PM
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Originally Posted by roborovski007 View Post
yup, it is centered in the fork. it is a dual pivot side-pull caliper brake.
Since it's a front wheel, try flipping it and see if the problem remains on the same side and to the same degree.
Sometimes the dish is slightly off on the front, although there is no reason it should be.
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Old 04-07-12, 07:14 AM
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Problems solve with realigning and tightening the calipers, thanks guys for the guidance =) But what ponders me is that how does this happen ?
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Old 04-07-12, 08:11 AM
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Originally Posted by roborovski007 View Post
Problems solve with realigning and tightening the calipers, thanks guys for the guidance =) But what ponders me is that how does this happen ?
It doesn't take much of a bump to change the alignment. Have you driven anywhere with either two bikes in a rack or this bike loose in the back of a car recently?
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Old 04-07-12, 08:26 AM
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Originally Posted by onespeedbiker View Post
The usual suspect is the wheel isn't pushed all the way into the dropouts. You should always make sure the bike is on the ground when you tighten the QR. The other possibility is your pads are worn.
That's so common that it merits re-saying even though the OP said his wheel is centered in the fork. Set the bike on it's own wheels, loosen the quick release and re-tighten the quick release while pushing downward on the stem.

I once went to a group ride in which a fellow had actually gotten out a spoke wrench and was getting to redish a front wheel that was simply not seated in both dropouts.
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