I need to replace my cassette (Shimano HG30 8speed 11-32) and chain (KMC Z7) that is currently on my bike (pinnacle Aura), however these parts are now discontiuned and I need to find the replacments. I have been recommended the HG51 cassette but don't know which chain to get. Can anyone help?
I have just purchased Shimano HG51 (11 - 30 tooth) casette and HG50 chain... I haven't fitted them yet but I have been advised they are compatible... see original post here.
Shimano HG-XX cassettes are definitely not discontinued; just the numbers have changed. HG-30 became HG-40, and now HG-50. You can find an 8 speed HG50 cassette in the gearing ranges from 11-28T to 11-34T ("Mega Range"). You can also replace with a non-Shimano cassette, which is compatible with the HUB. For instance SRAM PG-850 and others.
The cheap KMC 6-8 speed chains are everywhere. Maybe not exactly the "Z7", but some other number like "Z51".