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I have a spare 10 speed cassette (I think Tiagra 4600), can I use that or am I better off buying a new one? If so, any suggestions?
You won't be able to set up the shifting properly with a 10 speed cassette and 9 speed shifters. As for a new one, pretty much any shimano cassette with the same cog sizes will be suitable - you might not be able to find a new ultegra-level one, but as sora is 9 speed currently, there should still be some around.
Aiya. I didn't think the teeth pointing in all directions like a Royals family portrait was a good sign, thanks for confirming. I don't even know for sure what cassette this is, I assumed a 9 speed Ultegra 6500 but this bike has some Dura Ace bits on it, and the previous owner set it up quite, ahem, uniquely, so it could be anything.
I have a spare 10 speed cassette (I think Tiagra 4600), can I use that or am I better off buying a new one? If so, any suggestions?