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Me and my wife have had our '06 out for about a month, stored at our house for winter, and noticed the rear wheels are completely balled evenly across. We had new tires put on last September,Firehawk Wide Oval RFT, drove it for two months and put away the beginning of November. The only extensive driving was down to Corvette Expo which was about a 6 hour drive last month. What could be causing the the rear wheels to ware so quickly, the fronts still look new. We are both over 40 and drive both our 86 and 06 like babies. Any thoughts or info would be appreciated. We are also running Nitrogen in the '06 tires.
Best answer above is someone borrowed your car.
Excess burnouts.
Even wear across both tires, so that implies alignment is good.
We can guess you monitored your tire pressures, yet your standard pressure setting was not mentioned.
On your trips did you load heavy luggage into the trunk or tow an autocross trailer?
You have mentioned time but not mileage.
Is 15K mileage the average for a set of rear Firestones? Maybe.
Else, I guess the only other option would be the rubber compound was defective. Yes, a picture would help.
Suggest you double check the air pressure and have the alignment double checked. My Firestone dealer did an alignment, put on new Firestone wide oval tires, 12 months later the rear tires were ruined because the alignment was way off. I bought the lifetime alignment, now will take it in there every quarter to have them check it.
If the wear is even all the way across, then you had someone help you adjust the tread depth on your tires. Unless you did it by burning the rubber off in the bleach box.
The rear and front will wear evenly if you don't "accelerate" the hell out of the rears and scrub off the rubber.