May incur an oversize handling fee at checkout, depending on your location. No fee for pickup orders.
Oversize Debug
Tier code
Tier priority
Tier max weight (lb)
Tier max girth (in)
Product weight (lb)
L × W × H (in)
Girth L + 2×(W+H)
Requires acktrue
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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 are suitable for low to mid-range CC motorcycles that came from the factory with sealed chains. 520SO can be used for both on street and off-road up to 400ccs. 520SO is available only in natural finish.