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Just fitted some old Shimano rotors to my current bike. They are the floating ones with alu spider and steel braking surface. The front is slightly bent, as is common for rotors, but when I brake hard it makes a clicking/creaking noise. Pretty sure it's caused by the floating bit moving - perhaps because the rotor is slightly bent. Although the bike it came off never exhibited such a thing. The rotor was reasonably bent within working tolerance when I fitted it, I've smoothed it to the point where it's no more bent than normal, but it's still doing it.
Anyone else experienced this or managed to fix it?
I didn't think Shimano did floating rotors, the ice tech ones just have an alu carrier riveted to the steel braking surface. They're fixed though, not like Hopes which do have a bit of float.
Is it not the pads moving in the caliper?
I think there's some float in the rivets. Maybe there isn't supposed to be, and that's my problem?
I am pretty sure it's the rotor because the noise is actually spoke pingy sounds - it's the grating movement of the disc that is resonating in the wheel. Sounds like a slack spoke but it isn't. It does it each revolution if I brake hard.
There's certainly no float in my RT76s. As above, it's a solid connection.
I may be missing something, but if one of my rotors is bent, I either straighten it, or if it's beyond that, replace it.
I do the same, have done for years, and I have straightened this one as near as dammit. Except this one clicked before I straightened it and still clicks afterwards.
Right. Fixed it.
The pinging sounded like a spoke, but I thought it was the rotor clicking and resonating through the spokes. And I'd only changed the rotor, so it must've been that. And none of the spokes were obviously loose.
However, turned out one of the spokes was slightly under tension, with the result that as I applied the brakes the forces in the wheel caused it to bow out slightly, which made it touch the caliper. I must've adjusted the caliper inwards slightly to fit the new disc.
The looser was running over a tighter one, so it was bowed out more. Tightened it up and the tension brought it in.