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You should replace your cog with your chain as they age together.
You do this? Your chains must be fuuuuuucked (or you buy shit / alu cogs or throw good ones away early).
I go through several chains per cromo cog.
I go through rear wheel bearings almost as often as chains now because turbo trainer /csb
More expensive chains are more expensive for a reason. They are better. They are made of higher quality materials.
Cheaper chains will wear quicker and then damage the cog. You should replace your cog with your chain as they age together. Buy a decent chain with a decent cog and they will wear together but over a longer period.
You get what you pay for in life.
Here's some pictures of a cheap BLB cog after a year with a cheap KMC chain and a Phil Wood cog with a Izumi super toughness. Pretty much zero wear on the expensive Phil Wood combo. But you'll want to replace the shark tooth BLB combo.
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