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Hi I think I would take the tires back and have them rebalanced, if there is any cupping or uneven wear the tires will shake, also if there is any debri on the hubs, the front wheels of a 911 a very sensitive, I would ask to see the tire run on the balancer, look at the very bottom edge(the balancer cover will only allow you to see the botton) if the tire moves any you have found your problem, the problem will increase with the size of the wheel, less sidewall less cushion. the tires can move side ways or up and down either way there will be a problem, also ask how fast there balancer is rated, most are only like 60, so I think I would find someone that works with performance wheels and tires more, maybe a discount tire, dont let them tell you different if the tire moves one the wheels, sometimes they can rotate the tire 180 degrees to take care of this, matching the high spot of the wheel with the low spot of the tire, (the little dots on the side of the tire), Kevin
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