Thread: Tire size?
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Old 01-14-2012, 01:12 PM   #6 (permalink)
brucepick
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Quote:
Originally Posted by SpencersGreenTurd View Post
... The size on the car and the plaque is 235-65-16 Walmart says it takes 215-70-16 or 235-70-16...
A quick rule of thumb:
If you DECREASE the first number by 10 (235 becomes 225)
you will need to INCREASE the second number by 5 (65 becomes 70).
That way your tire's outer diameter stays nearly unchanged.
You can work it the other way too, increase the first number by 10 and decrease the second by 5. The last number is the rim diameter and that must stay the same for this rule to work.

Yes a tire size calculator is more precise and more informative. But if you can carry this method in your head, it will always be there when you need it.

Try the info at TireRack.com.
Or do a web search for "tire size calculator"; I think you'll find some.
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