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You are here: Experts > Autos > Auto Parts > Tires > tires
Expert: Barry Smith - 10/29/2009
Question
Barry,
Is there a chart that gives the circumference of tires. My P>U> has 235-70-16 and I want to no what size 15"tires are the same.
Thanks Bob
Answer
Bob,
There are any charts like that, but there is a calculator that will help you:
http://www.1010tires.com/TireSizeCalculator.asp
According to this calculator a 235/70R16 has about the same diameter as a 235/75R15.
But that is only half the story. You also need to consider the load carrying capacity - and you should never go lower in load carrying capacity than the original tires. The easy way to tell is with Load Index - and that is the numbers in the code known as "Service Description" - the last digit is a letter that indicates the speed rating, and you shouldn't go lower in the alphabet (lower in speed rating).
So a typical 235/70R16 has a Service Description of 104S , but you should check your vehicle tire placard to see what the original tires were. The placard is usually located on a doorpost or in the glove box – but sometimes it is located in the trunk or on the fuel filler door. Please check the placard because what I am about to write is dependent on this being correct.
Assuming that I have the correct Service Description of 104S, a 235/75R15 would have to have a minimum of a 104 Load Index and an S speed rating - and such animals exist!
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