Bought these to replace whining rotors on my road bike. With SRAM E-Tap hydraulic brakes, I got the 6-bolt rotors as a set and mounted them to the center-lock wheels with Shimano adapters. After seeing the brakes howling a bit, my friend suggested trying Shimano rotors. Problem solved. I'm not sure if the howling was from the SRAM rotor or from using a 6-bolt adapter, but these Shimano rotors are much quieter and brake at least as well, if not better. Fully compatible with SRAM BTW brakes. Looking at the design of the two rotors, I suspect Shimano is dampening the vibrations a little, or at least has a different resonant frequency to minimize the problem. Doesn't stop getting better or worse as far as I can tell after a few thousand miles.
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