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if its shaky den it's wheel balance..

I had the exact same problem, took it in for a wheel balance (obvious solution)

When they jacked it up at the shop i had a look and the dick before me had put spacers in (to push the rims out), which was the cause of my tyre hitting the wheel guard at every little bump, but when i took the spacer off i noticed there was no hub locater. The lack of a hub locater meant that the rim had play between it and the hub. Machined up two of these little bad boys and problem fixed =no shake

This will only be a prob (i think) if you have aftermarket rims and if the guy that had the car before you was a dick, or the dodgey dealer you bought your car from was also a dick (had these problems)

Cheers

Or it could be as simple as a wheel balance -- easier fix too

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Wheel alignment will fix how the car travels down the road. If you take your hands off the wheel and the car continues to track straight then the wheels are aligned.

If there are vibrations, then it is probably (with exceptions like mentioned above) going to be wheels out of balance. Most balancing centres can only balance 16-17" rims. I tried to have some 18"s balance and had to have them driven across town to find a big enough balancer. Without casting dispersions upon the guys that did the balance, they may have taken a short cut with your balance if they didn't have the right equipment.

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