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?
Any 8-speed chain should work. If you want to be absolutely sure, get one made by the same company that made the cassette. I believe Shimano still makes several 8-speed chains.
1I used to use Shimano IG-51 with HG cassettes. As pointed, any 8speed chain work. Nowadays, KMC has having the best cost-benefit for me, specially considering its Power Link (makes life MUCH easier, I take the chain out of the bike for cleaning) Mar 7, 2012 at 17:01
I once had a compatibility problem with a Surly fixie cog and a KMC chain. Theoretically, they should have meshed perfectly, but they didn't, and I have no idea which one was at fault. So that's the only reason I recommend getting the same brand for the chain and the cogs. Mar 7, 2012 at 17:44
I ride fixie, and my cog is thicker than mtb so that it won't fit an 8 speed chain (these were named "narrow" some time ago...). I have to use a common BMX chain. Was this your case? Mar 7, 2012 at 18:50
I'd have to go home and check, but I'm pretty sure my bike has an HG51, and I'm using an SRAM 8-speed chain. Have had no problems. Mar 7, 2012 at 20:19
I was using a single-speed BMX chain. So like I said, it should have fit. I realize that this sort of problem is pretty rare. (Also, now that I think back, it wasn't a KMC chain, it was something else.) Mar 7, 2012 at 22:30
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.
Difference between Shimano HG51 8-Speed Cassette and Shimano HG50 8-Speed Cassette
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".
I've had no luck with KMC chains, and would not consider them in the future. One lasted three weeks before throwing a side plate. Chain is like brake pads and tyres, not a place to save money.– Criggie ♦Mar 30, 2016 at 1:41
1@Criggie Indeed, KMC chains are the bottom-of-the-line cheapest stuff.– KazMar 30, 2016 at 18:47