The RK Excel 520SO-106 is a traditional round O-ring drive chain designed for low- to mid-range motorcycles, ATVs, and off-road vehicles originally equipped with sealed chains. This 520-size chain includes 106 links and uses RK Excel’s natural-finish steel construction for dependable performance in both street and off-road applications. It is rated for engines up to 400cc and applications producing up to 60 horsepower.
The RK Excel 520SO chain features nitrile butadiene rubber O-rings that help retain internal lubrication while limiting seal drag and power loss. This design supports smooth power transfer, consistent operation, and improved resistance to contamination compared with non-sealed chain designs. The chain is suitable for street motorcycles, dual-sport models, dirt bikes, and ATVs when the original equipment fitment calls for a 520 sealed chain with compatible link count and specifications.
With a tensile strength of 6,900 pounds and a maximum chain width of 0.854 inches, the RK Excel 520SO-106 provides a practical balance of durability, efficiency, and value. A clip-type master link is included for installation. Verify the vehicle manufacturer’s chain size, required link count, clearance, and master-link configuration before installation. The RK Excel brand and manufacturer part number 520SO-106 identify this chain for replacement and fitment reference, while the vendor part number is also 520SO-106.
Features:
- Size: 520 chain with 106 links
- Model: 520SO
- Brand: RK Excel
- Manufacturer Part Number: 520SO-106
- Vendor Part Number: 520SO-106
- Construction: Steel chain with natural finish
- Seal Type: Nitrile butadiene round O-rings
- Application: Low- to mid-range motorcycles, ATVs, and off-road vehicles originally equipped with sealed 520 chains
- Maximum Engine Rating: 400cc for street and off-road/ATV applications
- Maximum Horsepower: 60 HP
- Tensile Strength: 6,900 pounds
- Master Link: Clip type included