RK's traditional round O-ring chain is a convenient blend of performance and affordability. SO's O-ring is constructed from Nitrite Butadiene to seal in lubrication and deliver smooth power with minimal seal ring drag or loss of horsepower. 520SO chains a
XMAS BREAK LAST SHIP DATE 18 DECEMBER
📦All new orders placed after that date will be shipped once we return on the 5th January 2026
Add to cartSold out
Choosing a selection results in a full page refresh.