when I had that happen, it was a bad balance. 2 of the tires were out of balance even tho they were just mounted a few days ago (20'').
After springs, I get a little shake when the tires are cold at around the same speeds, but it goes away once it warms up.
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2011 370 Z Ark - Seibon - Aerojacket - Pioneer - Evo-R - Stance
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