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Thread: changing cogs

  1. #1
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    changing cogs

    Is changing a cog a simple matter of removing the locknut, replacing the cog, and then putting the locknut back? I guess the threads could be cleaned and greased too. Is that it?

  2. #2
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    Yep. pretty much.

    On a cassette hub, check that the base of the replacement cog is the same width. You may have to adj with a spacer.

  3. #3
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    Thanks. Guess the spacer is to keep the chainline straight? The new cog I ordered is a surly bmx single cassette 19T cog. It looks about the same width(maybe slightly wider) as the cog that's on there. Hope I ordered the right one. It looks like I have a cassette free hub. The bike is a Fisher Rig. I also got a Lifu BB/lockring tool to remove the locknut.

  4. #4
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    No Worries.

    The Surly cog is a bit wider than the stock one. If I remember correctly, the Rig is spec'd with a Bontrager cassette rear, Shimano DX cog, and spacers. Any Rig owners care to confirm? If the spacers are narrow enough, you may only need to remove one from the end of the stack.

    Good luck. Wrenching on your own bike is half the fun of owning one.

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