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Discussion Starter · #1 ·
Hi, I have a worrying squeal which has developed on my commuter bike. It makes a loud squeal when the bike is rolled backwards, but not at any other time...

The bike is a Felt QX alloy frame, with Tiagra 4600 Cranks and BB attached. The sound seems to come from the BB area, although I know this can be misleading. Any help appreciated :)
 

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Matnlely Dregaend
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Tell the pig to start pedaling! :D

I would take the chain off and spin the rear wheel and the crank backwards to isolate the noise. Then I'd spin the cassette on the wheel.
 

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My gut is telling me to look at the brakes. I'm guessing one is rubbing oh-so-slightly and moving forward is quiet but moving backwards is against the wear pattern and subsequently making a slight noise, resonated by the frame making it hard to pin-point.
 

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Discussion Starter · #5 ·
I thought maybe brakes too, although the noise sounded metallic, like a disc brake (the bike has rim brakes).

I went to have a good look at the weekend and, guess what... I couldn't replicate the problem! I'll have to wait. Thanks again for replies.
 

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Discussion Starter · #6 ·
The noise came back this morning, and ruled out a few things, as it happened whilst rotating the pedal (backward) to start position. So, definitely not brakes and probably crank or FD.
 

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Discussion Starter · #8 ·
Thanks, Doc. I'm sure the walk home will be fun after I don't roll the bike back out of the rack at the train station...
 

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I did have a time when I had a string or maybe hair (it was eventually covered in grease so it was hard to tell) that was wrapped around the crank near the bearings. You might want to see if there's something obvious like that you can clean out. Something that changes tension when rotated backwards that changes applied pressure and subsequently rubs differently causing the squeak.
 

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So, not rolling backwards, but pedalling backwards.

Somewhere in your drivetrain, or freehub. Don't see how a chain rubbing a front derailleur would make a squeal. That would make a rubbing sound. :)

Lubrication? Clean and freshly lubed chain? How about jockey wheels? Squeal doesn't sound like bottom bracket noise. Do you ride this bike in rain and/or snow? Is there salt used where you are?
 

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is riding in MOPP4
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Well, he also said that it sounded metallic, so it could be anything. Just trying to exclude the pertinent negatives.
 

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Pedal bearing? Stick another pedal on there and see if it goes away. Odd that it's only one way, but bikes have a way of acting illogically. If it's a squeal and not a creak, it's most likely a bearing somewhere. Anything rubbing on your FD would be obvious.
 

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Discussion Starter · #14 ·
...aaaaand it has vanished again, when I had the time (and daylight) to look into it.

The initial occurrence (and the worst) was on rolling back, not pedalling. It is easily possible that the cranks were turning when I was rolling back, I didn't check... but that would rule out pedal bearings.

It is very loud and seems to be resonating in the frame, and also seems to come from the BB area. I am aware that these things can be misleading, but I son't think it's freehub or FD rub.

The bike is my daily commuter (only short distance, to the train station and back, a couple of steep miles in all weathers). It does get covered in road water and general crap, occasionally including salt. I give it a good clean every 3 weeks or so... maybe not good enough!

Thanks again for all suggestions.
 
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