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post #1 of 5 (permalink) Old 01-25-2011, 07:41 AM Thread Starter
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Tire Size

I was looking at my door tag for tires. It states that the optional size is P215/65R-15. Doing some research that size is just about 1" in diameter smaller than the 215/70R-15 tires that came with it stock.

Will 1" make a noticable difference in the speedometer? 3.8 liter LX 1992.
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post #2 of 5 (permalink) Old 01-25-2011, 08:43 AM
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Here's the calculator you need to use.

http://www.miata.net/garage/tirecalc.html

Speedometer with non-stock (215/65R-15) tires will be 3.2% to fast. When your speedo reads 60 MPH you will be traveling 58.1 MPH.

I recommend 235/60/15. You can get the Firestone Firehawk Indy 500's in this size. They're an excellent tire.

Read this article:

http://forums.tccoa.com/showthread.php?t=133210

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Last edited by Trunk Monkey; 01-25-2011 at 08:53 AM.
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post #3 of 5 (permalink) Old 01-25-2011, 09:22 AM
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Quote:
Originally Posted by Trunk Monkey View Post
I recommend 235/60/15. You can get the Firestone Firehawk Indy 500's in this size. They're an excellent tire.

http://forums.tccoa.com/showthread.php?t=133210
+1

The difference in handling and grip between even the 215/70 version of the Indy 500s and the cheap (read, mismatched budget) tires that used to be on the car was pretty astounding. Imagine taking a normal 90 degree stoplight intersection turn at 20 MPH; the old tires would squeal like nobody's business. Indy 500s? Take it at 25, not a chirp. They're priced well too.

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post #4 of 5 (permalink) Old 01-25-2011, 09:35 AM Thread Starter
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Thanks. I knew the change would be small and thanks Trunk Monkey for the calculator.
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post #5 of 5 (permalink) Old 02-21-2011, 04:19 PM
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Quote:
Originally Posted by theterminator93 View Post
+1

The difference in handling and grip between even the 215/70 version of the Indy 500s and the cheap (read, mismatched budget) tires that used to be on the car was pretty astounding. Imagine taking a normal 90 degree stoplight intersection turn at 20 MPH; the old tires would squeal like nobody's business. Indy 500s? Take it at 25, not a chirp. They're priced well too.
+1 I'm having these in 235/70/15 mounted on my car as I am typing this. At $395 mounted balanced + taxes, I can't complain. I am having the shop save my front BFG g-Force sports for when I go to the track since they still have about 3- 4/32" left on them.

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