RK 520SO is a Classic ! The best choice if you are looking for an economical chain for motorcycle from 250cc to 400cc. Developed with Polaris ATV with Special Heat Treatment for Off-road Usage."
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RK Racing Chain Series apply RK?s only technology of Ultra Thin Seal, U-Rings or UW-Rings, where the thickness of seal is less than 50% of the common seal, make it possible to design a Sealed Chain with the weight of...
RK 520 EXW is designed to meet the Extreme requirement of rally races such as Dakar Rally, featuring RK?s only technology of XW-Ring and improved Thermal Fatigue Resistance.Application:250-750cc"
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