Kumho Ecsta SPT tires that I used on my supercharged 1994 Mazda Miata recently wore down to 3/32nds of an inch of tread depth. Note that I only drive this car in warm, dry weather so I use Ultra High Performance Summer tires. Because I don't drive in wet and snowy conditions with this set, wearing the tires down to that low of a tread depth wasn't a problem for me.
If I were driving the car year-round, I would have began my search sooner as tires that reach 2/32nds of an inch of remaining tread depth are considered worn out in most states. Plus, the reduced traction in snow and on wet surfaces would have made for unsafe driving situations. Read more about when it is appropriate to replace tires in, "What Honest Abe Doesn't Tell You About Minimum Tread Depths."
Which tires did I replace them with and why? I chose the Firestone Firehawk Wide Oval Indy 500. I had the opportunity to drive on these Firestone Firehawk tires in our BMW 328i test vehicle and was impressed with the tire's quiet and smooth ride, as well as its dry grip. Price was also a factor in my decision because the car is now over 17 years old. After taking the car out on a first drive with this new high performance tire on all four corners, I confirmed that I made the right decision. For value, ride quality, handling and great dry grip in an Ultra High Performance Summer tire, the Firehawk Wide Oval Indy 500 is a great choice. And many of our customers agree, as the tire is currently the second-rated tire in our Tire Survey Results.
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