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PostPosted: Tue Oct 02, 2012 3:53 pm 
retrobike rider
retrobike rider
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Joined: Sun Dec 18, 2011 10:42 pm
Posts: 2189
Location: milton keynes
cant see it being the spoke tension barney seeing as the rotor is bolted to the hub not the rim if you see what i mean so the stress would go through the hub into the frame via the spindle.
i betting its the pads moving in the calipers. try new pads and make sure the mounts are good


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PostPosted: Tue Oct 02, 2012 3:55 pm 
Old School Grand Master
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Joined: Sun Jan 06, 2008 2:36 pm
Posts: 4007
Location: uk
Sometimes with these aftermarket rotors judder is caused by taking away too much of the top surface contact area and/or having the (sharks fins) too far apart.

If the juddering is only at a certain speed , say not slow but medium pace it may be harmonics, but as you said it's both wheels i'd check your pads 1st and make sure the disc isn't a tad smaller than it should be and wearing those pads a groove.

Although prob not harmonics, this can give a juddering feel when a caliper mount is not faced properly and vibes turn into bigger vibes that are then felt in the frame, but as i said as it's both wheels it most likely bad designed discs.

Also check they are both rotors are straight and pads are bitting evenly.


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