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Newbie question here.

Currently on my old Tiagra 4500, I have a Shimano HG50 9-speed Cassette, with 11-25T. I need another cassette, as I got a smart trainer, but it is a bit hard to find such a cassette. Can I use a CS-HG50 9S, but 12-25T cassette? What will be different?

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That will be fine.
The only difference is that you will lose ~9% from your top speed. Unless you are extremely powerful and wanting to sprint at the end of esports races you will never notice that loss of top speed.

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  • 1
    Thanks! So I can replace it without changing the chain or other parts?
    – Dan Cantir
    Apr 20, 2022 at 12:14
  • 3
    You'll need a tool to tighten the lock ring. That can either be in the form of a dedicated tool or an adapter to use with a wrench.
    – Andy P
    Apr 20, 2022 at 12:21
  • The chain must accomodate both largest-largest as a maximum length, and smallest-smallest as a minimum length. your smallest-smallest - length increases (-> changes inside the previous lengths), so it can stay the same.
    – Burki
    Apr 20, 2022 at 18:39
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    @DanCantir People usually tell you it's a good idea to replace the chain when you're replacing the cassette. A worn chain might not mesh well with a new cassette. But if your chain is still pretty new (I have no idea if it is or not), you should be able to get away without it.
    – Mike Baranczak
    Apr 20, 2022 at 21:57
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    @AndyP, OP will also need a chainwhip to tighten the lockring on the trainer because on a trainer the cassette will rotate clockwise freely. On a wheel the free-hub will keep that from happening.
    – Carel
    Apr 21, 2022 at 9:08

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