Can you tell me if the belt in my driver's side front tire is broken? on 2002 Ford Focus

My daughter has a 2002 Ford Focus hatchback. The car thumps a little bit when driving, but you can mostly feel it through the brake pedal. My wife describes as if the car has square wheels. My daughter often hits potholes pretty hard. The tire is a Goodyear Eagle GT. There is a very fine hairline crack for about 1/3 of the tire on the sidewall close to the tread. I don't think it's wheel balance - just doesn't feel like that to me. I'm thinking the tire belt may be damaged. I have 2 questions: (1) does my diagnosis sound correct and (2)is the tire safe or should it be replaced?

by in Centreville, VA on April 21, 2013
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2 answers
ANSWER by , August 05, 2014
look for knot on tires
ANSWER by , April 21, 2013
jack the car up and put in drive and see if the tire wobbles ,while you have the car in the air check front end if the tire wobbles get it replaced as soon as possible