I had a popping noise under load when you first pedaled. I thought it was the lower crankshaft bearing kit that was replaced but it didn't help, I realized the only thing left was that sprocket. This fixed it properly. You'll need a special tool, but it's not difficult. I had to clamp the bushing in a vise, although I then used the wheel as a lever, the nut was very tight. A good product.
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