What Size Phase Converter Do I Need

How to Convert Tire Size to Acme

by Will Charpentier

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Tire sizes can be disruptive to the consumer since the data molded into the side of the tire seems to exist a cryptic string of numbers that simply a tire technician tin can decipher. That isn't the case, of course. The letter at the commencement of the numbers tells what type of service the tire is intended for: P for rider, LT for light truck, T for a temporary spare--the donut in the trunk. ST is for boat and utility trailers. The first three numbers are its "department width" and the second two are its "section height." The residuum deals with the tire's construction, the rim size it fits on and its speed and load conveying capabilities.

Step 1

Look at the sidewall of your tire and find a number that looks like this: P 225/40 R16 91S. The "section width" of the tire is the first three numbers, in millimeters. In this case, the section width is 225mm.

Pace two

Wait at the last 2 numbers in the sequence "225/40." The twoscore means that the elevation of the tire, measured from the tread of the tire to the rim of the wheel is 40 per centum (0.40) of the section width (225mm). Employ your calculator to piece of work out the height of the tire from rim to tread: 0.forty x 225 = 90mm. This peak is referred to every bit (a) the department height, (b) the serial of the tire, (c) the tire's profile or (d) the tire's aspect ratio, depending on who's speaking. A larger number means a higher sidewall.

Step 3

Calculate the size in inches by dividing the section width by 25.4, the number of millimeters in an inch: 225 / 25.4 = eight.86 inches. The section superlative is then adamant by multiplying eight.86 inches by 0.40 (forty percentage): 8.86 ten 0.40 = iii.54 inches.

You can decide the overall height of the tire, from the road surface to the tread on acme of the tire, by multiplying the section elevation by two, and calculation the rim size: iii.54 x two = seven.08 + 16 (remember that the ii numbers following the letter R tell yous the rim size. A tire marked "P 225/twoscore R16 91S" uses sixteen inch rims) = 23.08 inches.

References

Tips

• The last two numbers in the example, "P 225/40 R16 91S," are 91S and describe the load alphabetize and speed rating of the tire. The first two numbers in 91S refer to the load index. The higher the number, the more weight the tire can carry. Most automobile- and light-truck tires are rated between 70 and 110. In this case, a tire rated 91 tin behave most 1,356 pounds. The letter following the numbers is the speed rating. Modern tires are rated from 75 mph to 149 mph. An "Due south" rating is a mid-range tire capable of 112 mph, according to TireRack.com.

Things Yous'll Need

• Reckoner

Writer Bio

Will Charpentier is a writer who specializes in boating and maritime subjects. A retired ship helm, Charpentier holds a doctorate in applied ocean science and applied science. He is too a certified marine technician and the author of a pop text on writing local history.

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