EK 520 SRX2 Gold Chain Length:120 They are machined to exact

They are machined to exact specs with tolerances much more stringent than other aluminum sprockets and many times tighter than OE sprockets

Lab test have shown that QX-rings reduce friction by 40% allowing each chain to last up to 50% longer compared to a traditional O-ring chain

drilled and lightened case-hardened steel front sprocket

even finish

Weight reducing holes

EK 520 SRX2 Gold Chain Length:120 They are machined to exactThe EK SRX2 Series Chains feature QX rings that far out perform any factory O ring chain. Lab test have shown that QX rings reduce friction by 40% allowing each chain to last up to 50% longer compared to a traditional O ring chain. To keep rotating mass at a minimum, weight saving holes were drilled into every other chain link without compromising the chains strength. All of these properties combined leads to more horsepower delivered to the rear