I recently bought a “Shimano” cassette from Aliexpress – a fairly low end 8sp HG31 11-32. It was £11.62 delivered. If it’s real, I’m a Chinaman.
Reason for the purchase was that the daughter’s bike is 1×8 and in top the chain skipped every 11th tooth due to the chain catching on the 12t sprocket because of the chain line.
It came missing one of the 3 rivets in the back. I fitted it to the daughter’s Trek and it had the same issue as her existing cassette. I then found an old genuine Shimano cassette which worked perfectly well – no skipping at all.
On closer inspection you can see that the cassettes aren’t profiled the same on the rear of each cog – so it’s definitely dodgy. Probably a Sunshine cassette with “Shitamo” stenciled on it. Buyer beware.
P.S. anyone wanna buy a shatimo cassette?!?