It could be the next biggest cog is slightly piss, causing the chain to be closer to cog 4 at a point in the rotation. It's hard to tell but it definitely looks like the chain is closer to cog 3 at points in the rotation. If I can be arsed I might take the cassette off and sit the bits down on something flat for a better look.
It could be the next biggest cog is slightly piss, causing the chain to be closer to cog 4 at a point in the rotation. It's hard to tell but it definitely looks like the chain is closer to cog 3 at points in the rotation. If I can be arsed I might take the cassette off and sit the bits down on something flat for a better look.