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@TheShipwright
@turkish I reckon the difference between rotor thickness wouldn't be enough to create a noticable difference in performance. Its's the resting position of the arm where the cable attaches that makes the difference to feel/performance and it would be easy to check. Put your thin rotors in and adjust using the cable adjuster and watch the arm whilst you're adjusting it.
I have spykes and it's only when the arm is quite a bit off the perfect angle that it seems to make a difference although maybe the spyres have less overall movement and tolerances are less?