Kai, the 530 is the chain type. Hayabusa uses a very large chain with the very highest tensile strength. Tensile strength is important factor as we've been talking about breaking them lately. I broke one to on my ZX-11D one time, but bought a cheapy chain. Never do that again.
The suffix on the end of the part number is the chain links. So the first one you listed is 120 links, the 2nd one is 140 links for bikes with extended rear ends.
Gen-I stock length is 112 links. 17/40 teeth is stock.
Gen-II stock lenght is 114 links. 18/43 is teeth sprockets is stock.
The RK GB530GXW chain for example has a 10,000 lbs. tensile strength and rated for bikes up to 1400cc's.
Same chain, a GB520GXW for example, is only rated at 8800 lbs & rated for bikes only up to 1000cc's. Not recommended for high horsepower bikes like the Busa.
The suffix on the end of the part number is the chain links. So the first one you listed is 120 links, the 2nd one is 140 links for bikes with extended rear ends.
Gen-I stock length is 112 links. 17/40 teeth is stock.
Gen-II stock lenght is 114 links. 18/43 is teeth sprockets is stock.
The RK GB530GXW chain for example has a 10,000 lbs. tensile strength and rated for bikes up to 1400cc's.
Same chain, a GB520GXW for example, is only rated at 8800 lbs & rated for bikes only up to 1000cc's. Not recommended for high horsepower bikes like the Busa.