• Put it in a workstand and turn the cranks at a slow to medium rate, while having a close look at the chain and sprocket: you will be able to see how the chain and sprocket are meshing.

    It sounds similar to a problem I had with (I think) a Surly sprocket: the profile of the teeth was quite square and too long for the pitch of the chain.

    If this is the case you'll notice chainsuck at the top: the chain doesn't release from the sprocket freely, only once the tension is sufficient to pull it off of the tooth.

    At the bottom the chain doesn't immediately slip over the tooth, only when the tension forces it on.

    The chain "pinging" on and off the sprocket is quite noticeable.

  • At the bottom the chain doesn't immediately slip over the tooth, only when the tension forces it on.

    I just had a look at it and this appears to be what's happening. Any idea how to remedy it?
    Is it a case of sucking it up and hoping it beds in, or will another type of cog be better?

    I feel like the chain is lubricated enough, but would putting a layer of lubricant on the cog help lessen the snap and therefore the noise?

  • The profile of the teeth looks quite square, which is what appears to be the problem.

    I suppose it might bed in, but in the mean time that might trash your chain.

    Suck it up and get a Phil Wood.

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