520 525 530 O-ring X-ring Oil Seal Drive Chain Contains A Connector, For Racing Atv Utv Motorcycle Crf250 Yz450f Cbr600 Yzf-r1 - Motorcycle Chain & Transmission - AliExpress
X-ring chain - Wikipedia
Modern O-Ring and X-Ring chains DO NOT NEED LUBRICATED! ONLY CLEANED! I am prepared to die on this hill, but please, hear me out first :) : r/ motorcycles