I took my back wheel off of my back to change the tube, when I put it back on i realized the chain wasn’t going back on the pedal, it’s very hard to explain it but it looks like a part of the chain is on the wrong side of the bike if that makes any sense, I’ve sunk hours tryna fix it but nothing works, please help me

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    A picture would help. Commented Jan 22 at 0:27
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    Hi, welcome to Bicycles.SE Please include some pictures of your bike; right now we have no idea what's right let alone what might be wrong.
    – DavidW
    Commented Jan 22 at 0:43

2 Answers 2


Here's a picture showing how a chain should be routed:

enter image description here
Original source: https://www.popularmechanics.com/adventure/outdoor-gear/a22061530/how-bike-gears-work/

When fitting the wheel, you have to put the cogs side "into" the chain before lifting it up past the rear derailleur into the final dropout.

  • This is presuming you haven't split the chain, so it is still dangling on the bike.
    – Criggie
    Commented Jan 22 at 7:52
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    Image is slightly confusing as the chain should be behind the seat stay and the drive side crank.
    – Megavole
    Commented Jan 22 at 13:34
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    @Megavole good point - this is showing how the chain is routed. Fixed. (also I just noticed spokes are visible through the stays too, so its more of a "xray" )
    – Criggie
    Commented Jan 22 at 20:06

Look how the chain is routed on other bicycles around you. The path is seldom specific.

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