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brake pad rubbing rim

Old 10-06-13, 07:17 PM
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brake pad rubbing rim

I have a 2012 Specialized Globe Roll 8 with Alex Rims (not sure model of rim as Specialized site does not specify). I have put about 50 miles on the bike and am starting to see a wear mark on the rear rim. The rim is a deep-v rim and the wear line is about 1/8" below the space on the rim the brake pads are supposed to be hitting. I squeezed the brake and am unable to bring the pad any higher as it will then hit the tire. Is this something to be concerned about, or is it normal for the brake pads to go a bit below the space on the rim where the pads should hit? I have attached a photo of the wear line.
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Old 10-06-13, 07:38 PM
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Old 10-06-13, 08:25 PM
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The rim maker and the brake pad maker don't really communicate so, YES, the pad could be taller then the rim's side wall. But not all is lost. Because as long as the pad doesn't catch on the spokes or the tire's side wall it's fine. Rim side walls will get scored and gouged with the pads and the bits of crap that get embedded into the pads. Just pick out the bits and ride on. As pads wear they will tend to contact the rim further away from where they were originally set up. So just reposition the pad. No big deal. This is part of bike maintenance. Andy.
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Old 10-06-13, 08:35 PM
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If you're talking about that long deep scratch or gouge, don't sweat. It looks like the wear indicator groove. You can wear the rims until you reach the bottom of the groove, at which it disappears and you need to think about replacing the rim
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Old 10-06-13, 09:17 PM
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Originally Posted by FBinNY
If you're talking about that long deep scratch or gouge, don't sweat. It looks like the wear indicator groove. You can wear the rims until you reach the bottom of the groove, at which it disappears and you need to think about replacing the rim
Apologies for the upside down, unlabeled photo. The line I am referring to is the white line closer to the spokes.
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Old 10-06-13, 09:29 PM
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I'm having a hard time figuring out the profile of this rim. It appears that there's a raised and machined brake track, then a recess then the rim is wider where the shoe abraded it.

If so, you really want the shoe touching inside of the track, not because of possible wear, but because it can cause uneven braking. I use low profile rims, and often have issues with brake shoe overhang. I solve it with a coarse rasp, which I use to shave an angle or bevel so the shoe contact area is narrower. If you don't own a rasp, you can take the coarsest sandpaper you can find, and wind it around a wooden paint mixer to make a cheap tool for this job.
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