On the lookout for sprockets since mine are apparently on the way out (pics below), to me they look okay-ish and chain sag and tension is good. Unfortunately cant ask my dad since he is a cheater with his chainless 1200 Anyway what brand do I go with, where can I get them, does brand even really matter in terms of mileage? Would like to get 20k km out of them (mine are at 17k). OEM is out of the question, way too much moola.