My stock chain and sprockets (525/steel) lasted me 20k+ miles and still had plenty of life left... I just didnt see the need to risk pushing it more than that, though. I swapped it out with a 520/aluminum kit only because I wanted to have the same setup on the street and track bike.
I'd highly recommend sticking with the stock setup. You arent going to see too many 520/alum setups last 20k+ miles.
Changing the gearing -1/+2 is another story and fine, for the most part. I've heard going -1 in the front may reduce longevity/increase wear, but havent seen any evidence of it...
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