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Best replacement for 180mm Formula discs?

slimshady

¡Mira, una ardilla!
I'm tired of straightening the rotors in my RX brakes. They bend if you sneeze/burp close to them, and driving them straight again is a PITA. I was wondering if anyone has any recommendation on which other brand would work with them. I like how silent and turkey-gobble-free they run when they are straight, but I can't get them to stay true for too long.
 
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slimshady

¡Mira, una ardilla!
I know, but I also know some rotors play nicely than others with some caliper/pad combos. Even when the width of the discs vary very subtly among brands and models, some perform better than others.

Oh, also they have to be IS standard rotors, not centerlock.

On the Shimano side I was considering the RT66 (SLX) rotors.