I want to know if anyone knows if the steel used in the Hg200-8 and Hg31/41/51 cassettes is the same. I know the finish is different, but I don't care about the looks. I only care about durability in this case.
A lot of people on the internet claim it is the same, but no one seems to know or back it up. If you work at the Shimano factory or have done some metallurgic testing it would be great. Otherwise I want to know if people have tried both Hg200-8 (or Hg200-9) and the more shiny/fancy/expensive alternatives and noticed a difference in durability or not. It is not unthinkable that they use a cheaper steel in cheaper cassettes and perhaps they are made in a different factory. If you noticed other differences please mention them, but durability is the main issue here.
The reason for my question is that I'm not that happy with how fast my Hg200-8 cassettes(4-5000km)/chains(2000km) wear, and the cassettes are not made in such a way that I can just replace the most worn cogs. Will the more expensive cassettes last any longer? Thanks in advance.