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Old 06-23-12, 01:18 AM   #1
JakiChan 
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Rear wheel "moaning" when rolled backwards - brake rub?

My bike has started doing something kinda odd. It's a '12 Sirrus Comp with only about 125 miles on it. (I've had it a month.) In the last week or so it's started doing something funky - when I roll it backwards (like when parking it) there's a moan that comes up from the rear. If I pick up the rear and spin the wheel it looks like the brake is rubbing near the stem - but pretty much in reverse. Not so much going forward. I couldn't replicate it at the LBS, but I'm wondering if I need to adjust the brakes or something? Does this sound familiar to anyone?
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Old 06-23-12, 03:30 AM   #2
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Not sure what you mean by "stem" -- that's at the front. IF it's the rim rubbing odds are it's doing it forwards, too. Other things to check are how tight the skewer is, and that the wheel is mounted properly (take it out and put it back in). It could be a loos hub, but that seems very unlikely.
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Old 06-23-12, 11:47 AM   #3
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Originally Posted by adrien View Post
Not sure what you mean by "stem" -- that's at the front.
Valve stem. Do you call it something different on a bike? The part that sticks out and you put the air into it.
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Old 06-23-12, 01:13 PM   #4
Mr. Beanz
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Originally Posted by JakiChan View Post
Valve stem. Do you call it something different on a bike? The part that sticks out and you put the air into it.
I figured you meant valve stem when you said "rear, brake, wheel, brakes"

If the wheel is rubbing near the valve stem, your wheel is prolly out of true (not straight). It needs to be straightened.

The few times I have trued a wheel on the bike I hear the brakes somewhat moan when the rim rubs against the brake pad. It does it in one direction but not the other so I see why it might only do it when rolling backward....on a truing stand you do not hear the moan, only a scrape as the feelers on the truing stand are metal (mine anyway). On the brakes, it is a big rubber thingy that rubs the rim, that is where the moan comes from.

Take it to the shop and ask them to "true" the rim. Also ask them to adjust (if needed) the tension on the spokes. If the spokes on the wheel are lacking proper tension, the wheel will continue to go out of true (go crooked).

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Another thing, the brakes are set "toe in". This elimates the squeal noise while braking. So if you roll it backward, of course it will make noise as the brakes should be set to eliminate noise in the opposite direction.

But again, if it only rubs near the valve stem, the wheel is crooked.

Last edited by Mr. Beanz; 06-23-12 at 01:17 PM.
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Old 06-23-12, 01:23 PM   #5
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Right, brakes moan when you roll backward because you are defeating toe-in. If you get a rub at one part fo the rim, that area is slightly out of true. You can buy a $5 spoke wrench and learn to true it yourself or ask your LBS to give it a quick tweak, it's like a 10 second thing.
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