Squealing 180 Back Rotor on 575?

[petaypan]

Hi guys,

I've been riding my '08 575 for a couple of months now, and in the last 2/3 weeks I've noticed that the rear brake has started squealing for no reason that I can think of...
I especially noticed it today on a section of road, freewheeling around a corner - almost as if the back is flexing, causing the disc/pads to rub?
I'm running XTR wheels/180 rotors with XT caliper on the rear. I'm wondering if swapping to 160 on the rear might ease the problem and wondered if anybody else has experienced similar?

Pete

[tribegrandaddy]

I run xtr discs and this has happened to me and my dealer reckons it just a random thing with shimano discs mine normally goes off after washing the bike

[oomidamon]

I've had this on two 575s but both were running Avid Juicys. The first bike was loaned to me and was really bad - I could feel a vibration through the frame. My bike does it too, but not as bad, and not all the time. I wondered whether the 'floating' Hope rotors would help?

[tony berlin]

yeh i had this on my 05 575,there was some kind of vibration,i changed the caliber and it stopped

[theswede]

Mine is really bad. Reduced rear disc from 203 to 185 and the vibration and noise is ridiculous. It did nt do it before but I have'nt had a fiddle with it yet though. Avid codes by the way.