I bought this because I am upgrading my bike from 7 to 8 gears. My LBS told me the higher the number ie HG31, HG51, the better the cassette. So I got this and mounted it on my new wheelset. Assembly was easy with the right tools. This is an Alivio cassette and it's light. Slightly surprised at how easy it was. I use it with an Acera rear derailleur and a KMC X8.93 chain. With these components, my bike shifts even better than before and the quality is better than the originals. Great block for the money and would recommend this in place of low end cassettes for your 8 speed drive train.
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