all the chain companies make a 630, fuck oem. go with did or rk, or whatever your personal choice is. ek, regina, etc.
they came with 630's back in the day cuz chain tech wasnt as good as it is now. a 530 conversion would shed some weight, and be just as strong if not stronger than the oem 630. but its not needed if you already got both sprockets and chain all in gd condition.
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