D.I.D. 520 VX3 Pro-Street X-Ring V Series Chain Gold/Black Greater
rigidity (7% higher than previous VM). Higher rigidity creates smoother
handling, reduced power loss and quicker response. Highest value in all
D.I.D series. D.I.D X-Ring has half the friction compared to O-Ring
chain. Superior longer life than previous VM series. Replaces the
Professional O-Ring V Series and the Premium X-Ring VM Series.