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One side of brake rubbing again rim after tyre tube change

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One side of brake rubbing again rim after tyre tube change

Old 05-24-14, 05:01 PM
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One side of brake rubbing again rim after tyre tube change

Just fixed a puncture on my rear back tyre of a hybrid giant. But when I was putting the back wheel back on I noticed that the v brakes was pushed incorrectly by the wheel. I pushed the brakes to correct alignment. Problem now, is one side of the brakes is rubbing against the rim. I turned the bike upside down and spun the wheel & when it spins, one portion of spin looks 'wobbly'.
The wheel and brake assembly was fine 20 minutes before I took it off. I know it happened when I disturbed the brakes initially.
Any help would be great
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Old 05-24-14, 05:08 PM
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If it wasn't rubbing before you took the wheel off and it's rubbing now, my first guess would be that the wheel's not quite seated like it was before. Assuming your wheels have quick release levers, stand the bike straight upright, release the lever, apply some weight straight down on the saddle, and re-clamp the lever. That should ensure the wheel's axle is firmly set all the way into the dropouts on the frame.

The wheel might also be out of true, or "wobbly" as you observed. That could be contributing to the problem, too. You can take the wheel to a bike shop to have them true it, or if you're mechanically inclined, you can true the wheel yourself using a spoke wrench.
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Old 05-24-14, 05:41 PM
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I'm going to agree that you didn't quite seat the wheel exactly the same. But if the rim has a wobble like you seem to describe where one part suddenly kicks over to rub the pad then your rim is in need of a bit of trueing up. It's not supposed to run wobbly like that. At most it should only wobble maybe a max of 1/16 inch or 1.5mm. And for many of us even that much would have us reaching for a spoke wrench. But for casual riding that much is just fine.

If you're a casual rider that never really thinks much about such things it would be worth having a bike shop work over your wheels to tension and true up the spokes. Factory jobs use a big machine that only gets things somewhere close. But the spokes bed in and take a set to their new home and that often leads to a loss of spoke tension and rims that run out of true. Consider the money spent on a wheel tune as insurance against a broken spoke or two at some point in the future.
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Old 05-24-14, 09:12 PM
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An unseated axle in the dropouts could cause the wheel to be off center and rub on the side of the brake, but it won't make it wobble.
It's very likely the tire bead did not seat on the rim correctly making part of it bulge more, which would look kind of like a wobble. Let almost all air out of the tire then go around it squeezing and flexing it (twisting or rolling side to side) to try and get the bead seated evenly then re-inflate to normal pressure.

For the brake, make sure the springs on both sides are hooked up. Also that the axle is seated in the dropouts before tightening it.
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Old 05-25-14, 05:39 AM
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Nothing in you did in your flat-fixing adventure has caused the rim to develop a buckle.

Good point that it might be the tyre and not the rim. When inflating a tyre, you should stop around 15-20psi and give the wheel a spin, looking at the bead seat line on each side, which is a small ridge moulded into the tyre just above the rim.

Often it won't be sitting right, and continuing to inflate the tyre will just jam it in place with pressure. Left long enough that way, a tyre will take a set and may not to want to seat properly. If you see the line deviate more than a mm or so, grab the tyre at that point and haul on it sideways; with only enough pressure in the tyre to give it shape, you can shift it around.

And chances are, the pad is rubbing now because either the wheel wasn't properly in the dropout when the brake was first adjusted, or it was and now it isn't. Seat the axle fully in the dropout by loosening the QR with the bike on the ground and rocking the rim side to side at the top of the wheel to feel when it's square. On V-brakes, there are little phillips-head screws at the base of the calipers for adjusting the spring tension to centre them.

Last edited by Kimmo; 05-25-14 at 05:44 AM.
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Old 05-25-14, 06:11 AM
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A Giant hybrid with V brakes. Well that could be a bike that's some years old now. Could have a rear hub that's got a screw on freewheel. And the axle could have bent. Take the wheel out and spin the axle, checking that it doesn't wobble.
The springs in the V brakes could have weakened over time. Theres often little screws on the sides of the brakes to adjust spring tension. might need the side that rubs, screwed in.
The most likely thing will be the spokes tho. They can loosen over time. maybe snap, but still stay in the same pattern. I suggest to grab each pair of spokes that cross, and feel if any seem looser than the others. Drive side spokes are under more tension, and more likely to snap. Spokes can be trued up at home. Spoke keys aren't that expensive. Changing broken spokes in rear wheels can be complex as you need to get the cogs off. But can be done at home, with a few special tools.
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