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Old 09-26-11, 11:34 AM   #1
MegaDave
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Rear rotor rubs only when sitting on bike

I'm having a hard time figuring out why this is. Any help is greatly appreciated.
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Old 09-26-11, 12:43 PM   #2
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I'm suspicious of a crooked swingarm...what kind of bike?
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Old 09-26-11, 01:04 PM   #3
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Broken stay, axle, hubshell or crack around pivot? If the swingarm were simply bent it wouldn't change the relationship between brake/dropout/wheel.

Last edited by ed; 09-26-11 at 01:47 PM.
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Old 09-26-11, 01:19 PM   #4
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Add: bad swingarm bearings/bushings; axle not bottomed in and or tight in dropouts; bad hub bearings.
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Old 09-26-11, 01:47 PM   #5
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Broken stay, axle, hubshell or crack around pivot? If the swingarm were simply bent it wouldn't change the relationship between brake/dropout/wheel.
Yeah...that's what I meant...
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Old 09-26-11, 04:21 PM   #6
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On second thought ed, perhaps it could be a bend - like if it were an FSR and only the chainstay was bent, it could be aligned when static but once the suspension was compressed it would change relationship to the seatstay/brake mount. Although I suspect that'd be highly unlikely.

Maybe the OP weighs 4 bills and the rear triangle is mild steel? We need moar data.
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Old 09-26-11, 04:25 PM   #7
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I'm suspicious of a crooked swingarm...what kind of bike?
It's a 2012 Giant XTC2 (hardtail).

Guys, I should mention that it rotor rubs against the brake pads, if that makes any difference. I only weigh about 150lbs aswell.


Last edited by MegaDave; 09-26-11 at 04:28 PM.
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Old 09-26-11, 04:46 PM   #8
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Then I would: 1) make sure your axle/bearings don't have any slop; and 2) that the axle is firmly seated in the dropouts and that your skewer is snug.
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Old 09-26-11, 04:50 PM   #9
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I still think it's the swingarm.
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Old 09-26-11, 05:08 PM   #10
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I got the bike two days ago, so I'll bring it in and have the place look at it.

Thanks for your help guys.
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Old 09-26-11, 05:21 PM   #11
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So it's brand new? Yell heah man, take it back. Prolly in the hub area as them doods said.
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Old 09-26-11, 05:51 PM   #12
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So it's brand new? Yell heah man, take it back. Prolly in the hub area as them doods said.
+1 If I bought a bike brand new and it was only 2 days old and something started rubbing, the last thing I would do is come here and start debating what I should do. Even though everyone here is really friendly, and usually very helpful, why would you try fixing a bike that not only has a warranty, but is literally brand new! I like to think that I am pretty handy with tools and pretty good at working on my bike (not as good as many of the people on here, but experience makes perfect), and I wouldn't touch a single thing on a bike if I bought it brand new except the occasional brake and derailleur tweak. And that is because when you buy a bike from a LBS you aren't just buying the bike, but you are buying their services, otherwise you would just shop online, and your LBS knows this. Let them figure out what is wrong with it, unless you literally took it down a mountain the day you bought it, you shouldn't have to be dealing with rubbing or noises with a brand new bike.
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Old 09-26-11, 06:12 PM   #13
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I wouldn't touch a single thing on a bike if I bought it brand new except the occasional brake and derailleur tweak.
That may be all that's required based on the limited info he's provided. Why waste what could be potentially hours if there's a possibility you could fix it yourself in 30 seconds?

MegaDave, have you tried realigning the caliper?
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Old 09-26-11, 06:23 PM   #14
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That may be all that's required based on the limited info he's provided. Why waste what could be potentially hours if there's a possibility you could fix it yourself in 30 seconds?

MegaDave, have you tried realigning the caliper?
True, I didn't fully understand what the issue was when I originally wrote that comment, I saw that he said it was a 2 day old bike and decided to say that any issue that can't be solved easily (and I mean extremely easily) then the bike should be taken to the LBS. But I also have never owned a brand new bike and would baby the heck out of it I/when I get one (I'm sure after owning many new bikes in the distant future I will look at it differently). BTW, aren't the pads suppose to rub the rotor? I know on cars the pads are alway in contact with the rotor. I'm assuming he is complaining about rubbing noise and not the actual rubbing itself.
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Old 09-26-11, 06:41 PM   #15
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It's refreshing to see some help in thread that doesn't assume everything.
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Old 09-26-11, 06:48 PM   #16
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That may be all that's required based on the limited info he's provided. Why waste what could be potentially hours if there's a possibility you could fix it yourself in 30 seconds?

MegaDave, have you tried realigning the caliper?
Yep, loosened caliper, pulled on brake, retightened caliper.
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