So I have really difficult time finding parts. I need to swap the rear cassette to a new one because the chain and some sprockets are worn out. However I can't find ig cassettes anywhere and I don't understand any of the numbers.
The bike was bought 1999 or so and has 7 sprockets rear and 3 in front. So 21 speed. It's been well maintained so I don't want to get rid of it now. I recently bought 2 ig chains (kmc z8.1) for spares and did maintenance and replaced other bits. So I have a bit of sunk cost fallacy going on here too. I think the front sprockets need replacements soon too.
Is there a 7 speed cassette out there that is compatible with my ig chains(kmc z8.1)? Some sram, kmc or cassette maybe? Could I use hg 7 speed cassette with my ig chains? Or do I need to just suck it up and swap to hg parts? And what all hg parts would I need? Or just buy new bike?