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520 size
D.I.D. Chain is the #1 chain manufacturer in the world and used by many factory racing teams. Wunderlich only uses D.I.D. chains on all our race and custom bikes. With D.I.D. you can ride in confidence knowing that you have the finest chain available.
D.I.D X-RING is superior to other types of o-ring designs. The X-Ring results in less 50% less power loss due to friction. The X-Ring's four contact points greatly increase its sealing performance. This keeps the dirt out and the lubrication in much better than any other O-Ring.
Pro-Street X-Ring VX Series chain: