Tsubaki 525 Omega O-Ring Chain Steel-120 Links Ideal OEM replacement chain for bikes with a maximum 750cc displacement 9,000-lb. average tensile strength (530) is perfectly proportioned to provide maximum strength with minimum weight Power-robbing friction and drag normally associated with O-ring chain is virtually eliminated with shouldered and projected bushing construction Features select alloy steel with vital components heat-treated, then shot-peened Each chain is prestressed and pre-stretched at the factory to minimize initial stretching