How old are your rotors? I have experienced speed-specific wheel shake and I balanced. rebalanced my wheel to no avail. I had my rotors turned and the shake vanished. They can set up a harmonic vibration at certain speeds with very minor imperfections.
I hope this helps.
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Koni|Swift|Michelin|Motordyne|Berk|RJM Performance|Gates|SPL|Motul|Technafit|Ate Super Blue|Hawk
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