• 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?

  • Aren’t they just how the teeth are shaped to improve shifting. The shape looks too uniform to be damage.

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