• I use those cheap KMC chains and they last a lot longer than that. Probably get a year out of one depending on the weather. I think maybe your cleaning and degreasing might be a factor. I find when cleaning the chain, unless I painstakingly go over every tooth on the cog and chainring, I end up with tiny bits of grit working its way into places it wasn't previously, which makes a horrible grinding sensation for a few rides. That doesn't do it any good so I tend to just lightly wet lube the chain and only clean everything if I really have to.

    And obviously the usuals are check your chain line, don't run the chain too tight, check the chainring or cog aren't knackered.

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