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  1. No way to know for sure if you don’t show the center of the rotor.

    With that said, the standard Shimano rotors that are spec’d with 105 groupsets are centerlock.

  2. It looks like rivets not bolts with torx heads, i.e. it’s center lock. Maybe it’s Shimano SM-RT64.

  3. In the end it doesn’t matter. I have one of each type for my gravel bike, I just had to buy rotors to suit.

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