2007 Nissan Other

Tires and Wheels problem
2007 Other Nissan Models V8 Four Wheel Drive Automatic 47,000 miles

I need to buy a tire. Should I buy only 1 tire or is it better to buy 2 tires. Also my steering wheel shakes when I press the brakes if I am driving @ 60mile per hr?
July 23, 2008.

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