{"product_id":"rk-excel-520so-104-520-x-104-link-o-ring-motorcycle-drive-chain","title":"RK Excel 520SO-104 520 x 104 Link O-Ring Motorcycle Drive Chain","description":"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.\n\u003cp\u003eThe RK Excel 520SO-104 drive chain is a traditional round O-ring chain designed for riders seeking dependable performance and affordability. Built for low- to mid-range motorcycles that originally use sealed chains, this 520-size chain is suitable for both street and off-road applications on motorcycles and ATVs up to 400cc. Its natural steel finish provides a practical, durable solution for everyday riding and replacement applications.\u003c\/p\u003e\u003cp\u003eThe RK Excel 520SO features Nitrite Butadiene O-rings that help retain internal lubrication while limiting seal-ring drag and power loss. This construction supports smooth power transfer, consistent operation, and reduced maintenance compared with a non-sealed chain. The chain includes a clip-style master link for installation and is supplied in a 104-link configuration.\u003c\/p\u003e\u003cp\u003eFitment is intended for compatible motorcycles and ATVs equipped for a 520 chain size, with a maximum recommended rating of 400cc for street use and 400cc for off-road or ATV use. Always verify the original equipment chain size, link count, clearance, and manufacturer recommendations before installation. The RK Excel manufacturer part number and vendor part number are both 520SO-104.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBrand: RK Excel\u003c\/li\u003e\n\u003cli\u003eManufacturer Part Number: 520SO-104\u003c\/li\u003e\n\u003cli\u003eVendor Part Number: 520SO-104\u003c\/li\u003e\n\u003cli\u003eChain Size: 520\u003c\/li\u003e\n\u003cli\u003eChain Length: 104 links\u003c\/li\u003e\n\u003cli\u003eChain Type: Round O-ring sealed drive chain\u003c\/li\u003e\n\u003cli\u003eMaterial and Finish: Steel with natural finish\u003c\/li\u003e\n\u003cli\u003eO-Ring Material: Nitrite Butadiene\u003c\/li\u003e\n\u003cli\u003eTensile Strength: 6,900 pounds\u003c\/li\u003e\n\u003cli\u003eMaximum Application Rating: 400cc street, 400cc off-road or ATV\u003c\/li\u003e\n\u003cli\u003eMaximum Horsepower: 60 horsepower\u003c\/li\u003e\n\u003cli\u003eMaster Link: Clip type included\u003c\/li\u003e\n\u003cli\u003eRecommended Fitment: Low- to mid-range motorcycles and ATVs originally equipped with sealed 520 chains\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"RK EXCEL","offers":[{"title":"Default Title","offer_id":67558420021483,"sku":"691-1903","price":83.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0611\/3882\/9547\/files\/6c00-6936f294b2e70_019adc63-fae5-4ce5-988a-6f3ceeda9fa2.png?v=1790761618","url":"https:\/\/ctracingservices.com\/products\/rk-excel-520so-104-520-x-104-link-o-ring-motorcycle-drive-chain","provider":"Cascade Tire \u0026 Racing Services","version":"1.0","type":"link"}