funny huh. I just had my tires rotated and balanced. It was shaking like hell. I changed my tire pressure from 30 to 25 (GSX rims)and I can barely feel it now. I think I need to have it rebalanced after I get my wheels aligned since I haven't done it eversince I got new tires. But I think it's the balancing most of the time though. Won't be the control arm though because I had the same problem before and after I had them changed.