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Why do my pedals move when I move my wheel? How do I fix it?

Here is a clip:

This is the model: http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_786803_langId_-1_categoryId_165499

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Would you consider editing your question to add some text to describe the problem you're experiencing? The video is a little unclear, so a few extra words might be helpful. –  amcnabb Apr 15 '13 at 20:40
    
Or just consolidate it with your other question about the chain slipping as the two problems seem to be related. –  Johnny Apr 15 '13 at 22:50

3 Answers 3

This bike definitely has a derailleur and is not intended to operate as a fixie (i.e. something is definitely broken.)

A normally functioning multi-speed bicycle has a mechanism that allows it to pedal forward and coast (freewheel) when standing on the pedals. Many older or cheaper bicycles have a "freewheel" which accomplishes this. Other bicycles have a freewheel integrated into the hub body, a "freehub." They're essentially the same mechanism - a ratchet with a few pawls.

In all likelihood, the pawls inside of the freehub or inside of the freewheel have seized or have come apart. Procure a can of penetrating oil and spray the seam where the cogs and the hub meet (i.e. where it is supposed to rotate. I've included a photo with arrows indicating where to spray. Be careful not to get oil on your rims or brake pads.)

If this doesn't loosen it up, you'll need to either replace the freewheel or overhaul/replace your rear hub.

Cassette and Freewheel

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This is as close as I can get without additional information or better quality video. –  WTHarper Apr 15 '13 at 21:17
    
@Carnotaurus The other video you posted is indicative of this problem. The derailleur is being pulled taut because the hub isn't freewheeling. If you were to ride this as it is, the derailleur would likely be torn off when you stopped pedaling. –  WTHarper Apr 15 '13 at 21:28
    
I'm impressed that you can see a derailleur in that blurry video--I can't see anything. –  amcnabb Apr 15 '13 at 22:56
    
The angle that the chain heads out, but it is barely there. @Carnotaurus also posted a second related question regarding the same bike and you can see the drivetrain much better. –  WTHarper Apr 16 '13 at 0:15
    
Ok, I have a can of degreaser. So, I am going to try exactly this after work. –  Carnotaurus Apr 16 '13 at 4:44

If you flip the bike upside down (as you have done), then "pedal" in the "right" direction (as if you were trying to make the bike move forward), then let go of the pedal, the pedal should stay stationary (or maybe drift around slowly) and the chain should remain relatively straight and taut. If, when you let go, the pedal keeps moving pretty much at full speed or the chain bunches up, then the freehub/freewheel is not "free".

If that is the case, the first thing to check is for any sort of trash (leaves, string, etc) caught between the large rear sprocket and the hub. If you find nothing then the rear wheel needs to be serviced.

Since your mechanical ability is apparently quite limited, I'd suggest you take the bike to a shop, rather than attempt to fix it yourself.

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This is what your bike is supposed to do. The direction you are pushing the wheel corresponds to your pedals pushing forwards.

If this didn't happen you would not be able to pedal forwards!

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In the video he turns the rear wheel in both directions and the pedals turn with it in both directions. That is not what it's supposed to do. –  Carey Gregory Jul 31 '13 at 21:01

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