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As part of my ongoing quest for a reasonably quiet set of disc brakes, I'm wondering if the skeletal Magura Storm SL rotors I've fitted (ironically to try and achieve quieter wet weather braking...) are contributing to the issue.
Instinctively I'm thinking Shimano rotors with the aluminium carriers will be stiffer than a traditional rotor with spindly steel arms, but just wondering if I've overlooked any other brands.
Does the material thickness contribute? I'd understood the Magura rotors were actually 2mm instead of 1.8mm.
I don't get much heat in my brakes so would be sticking with 160mm (can't go smaller) and probably wouldn't want Ice Tech either...
Ta
Are the rotors perfectly centred when the brakes are applied? Is there any flex at all? If not (flex) then stiffer rotors aren't going to offer much better performance. If so, can you centre your rotors to see if that helps?
I imagine that the resonance thing is so complex that it's really just a matter of trial and error. You could have two rotors of the same thickness with different resonant properties. I would see if I could borrow a wheel and rotor and just try swapping bits around to see if anything makes a difference.
Thanks hols, sensible advice, I've got a brand new TRP rotor kicking about that I'll try out, then I'll decide to try new pads or new rotors next, depends what works out most expensive.
DickB, good point, although I thought the cause of (wet) disc brake squeel was the stick/slip mechanism causing resonance through the disc like a finger on a wet wine glass. Changing rotors would hopefully reduce the amount they resonated (although like Hols says it's probably trial and error finding the perfect balance).
EuanC, no, hadn't seen that! There used to be a US product that acted as a fine grinding paste that you smeared over the rotor and then braked on, provided a perfect braking surface. Just hope that Swisstop stuff just isn't re-labelled isopropyl!