EK CHAINS: CAN'T BE BEAT FOR PERFORMANCE VALUE! A BEST SELLER CHAIN LINE WHICH FEATURES SOLID ROLLERS, CONSTRUCTED WITH SOFT PEENED AND PRE-STRETCHED COMPONENTS FOR BETTER PERFORMANCE AND FEWER ADJUSTMENTS, ALL DRIVE CHAINES INCLUDE A CONNECTING LINK WHICH CAN ALSO BE PURCHASED SEPERATELY. SPORT 520 SRO O RING CHAIN: EK 520 O RING CHAIN IS EQUIPPED WITH SOLID BUSHINGS, A TENSILE STRENGTH PF 7400# WHICH CAN BE USED ON ATV/DIRT BIKES UP TO 250CC STREET UNITS UP TO 400CC WITH A MAXIMUM OF 40 HP CONNECTING LINK: RIVET TYPE EACH