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I change chains a couple times a riding season when I'm riding the same bike the majority of the time. Once at the beginning and once in the middle. When I'm home for an entire Alaskan road season (roughly mid April-late October), I average 5000 miles or so of wet, dirty pavement riding. Lots of cleaning and oiling. For 10 speed SRAM, I use 50-series chains. For 11 speed, I use 70-series chains.
My trainer bike gets a new chain once or twice a year, depending on how much I'm using it and how many times I've broken it down. I use SRAM 30-series chains on the trainer.
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