Tire Blowout Problems of Oldsmobile Silhouette

As I was checking the tires for wear I noticed that the inside of the tire, where the tread meets the sidewall, was damaged. It appears that there is a flange or disc at the bottom of the spring/shock assembly that's coming in contact with the tire. Less than 1 inch clearance. Probably happens when there's down force from hitting a pot hole, speed bump or sudden stop. Tread is good but separating from the sidewall, steel belts visible. 30,000 miles, goodyear, p225/60r/16, I assume original equipment. Bought used at 9k, no record of rotating the tires. Rear tire has slight damage suggesting it may have been on front and rotated out. If owners are only looking at the tread and not the inside sidewall I think there's a potential for blowout and tire separation. I note 2 failures although the tires have not blown, they will need to be replaced. Will have vehicle serviced this week.

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While driving on highway, the left front tire experienced a blowout at the sidewall which resulted in the tread separation. However, the sidewall remained on the rim. Tire info: michelin 225/60r16 dot-hd3vcthx1802 10-11k miles on tire not original left front tire.