High-Quality 520 8-Ring Drive Chain for Cycling - Durable Corrosion-Resistant Noise-Free

DIDVX series chain is an upgraded version of HV series chain, which is our most popular and widely used chain, whether for road bikes or off-road bikes. Thanks to our patented X-ring sealing technology, the chain life is 21% longer than the HV series. It also increases rigidity to reduce bending, giving you a more sensitive and smoother driving experience.DIDVX Series boasts a muchlonger chain life than the O-Ring Series due to the patented X-Ringtechnology. The 428-520HVX7 has a 32%longer chain life than the 520HVand the 525 and 530HVX7 has a41% longer chain life!For fast track sports, please order the series track competition special chain.● Part 2: Chain link number: It consists of three Arabic numerals. This number represents the number of links contained in the entire chain. The larger the number, the longer the chain. It is divided into ordinary type and light type according to the number of links. Letter code of model ZB. 120ZB means that the entire chain consists of 120 links.There are 4 sizes to choose from:428HV3136ZBINKS is suitable for displacement below 200CC520HV3120ZBINKS is suitable for displacement 200-600CC525HV3120ZBINKS is suitable for displacement 300-800CC530HV3120ZBINKS is suitable for displacement 800-1500CC