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What is a 245 tire in inches


Tire Size Calculator | Quadratec

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      • Reference

      • Jen
      • March 23, 2017

      How to Understand Your Current Tire Size

      Knowing your Jeep's tire size can be essential information when it comes time to replace that rubber, or even if you ever decide to change wheels. And while a stock tire size is imprinted right inside the driver side B pillar, you may not know what if have if you are not the original owner.

      So here is some helpful information to assist you in determining what you currently have on the vehicle.

      First, the sidewall of your tire contains all the information needed to understand everything about that specific tire. All tires are required to have this information, regardless of the manufacturer brand name.

      Now, this information could read in a few different ways. For example, it could simply say 35x12.5 R17, or it may show as P265 75 R15. If it is the first listing, then here is the breakdown. That first number is your tire size at 35", and then the second number tells you the tire width at 12.5". That third reading is the tire type as radial and diameter as 17".

      The second listing is a metric set up, and is what is more common on factory-type sized tires. From left to right, the P indicates a passenger tire while 265 indicates the tires width in millimeters. That 75 is the tire's aspect ratio and simply means the tire's height is equal to 75 percent of its width. Finally, like the first set of numbers, that R15 means it is a radial tire and has a 15" diameter.

      For those who have the metric reading on their tires, you can simply plug that into the conversion calculator to determine the tire size, or find that corresponding reading on one of the below conversion charts.

      Metric to Standard Conversion

      Enter the metric size (i.e. 285/75 R17)

      15-inch Wheel Conversion Chart

      Metric to Standard Tire Conversion Chart for 15 inch Wheels
      Metric Standard
      215/75/15 27.7"x 8.5"
      225/70/15 27.4"x 8.9"
      225/75/15 28.3"x 8.9"
      235/75/15 29.0"x 9.3"
      245/75/15 29.5"x 9.6"
      255/75/15 30.0"x 10.0"
      265/75/15 30.6"x 10.4"

      16-inch Wheel Conversion Chart

      Metric to Standard Tire Conversion Chart for 16 inch Wheels
      Metric Standard
      205/85/16 29.7"x 8.1"
      215/75/16 28.7"x 8.5"
      225/70/16 28.4"x 8.9"
      225/75/16 29. 2"x 8.9"
      235/70/16 29.0"x 9.3"
      235/85/16 31.7"x 9.3"
      245/70/16 29.5"x 9.6"
      245/75/16 30.5"x 9.6"
      255/70/16 30.0"x 10.0"
      265/70/16 30.6"x 10.4"
      265/75/16 31.6"x 10.4"
      275/70/16 31.2"x 10.8"
      285/75/16 32.8"x 11.2"
      295/75/16 33.4"x 11.6"
      305/70/16 33.0"x 12.2"
      315/75/16 34.8"x 12.4"
      375/55/16 32.8"x 15.5"
      395/70/16 37.9"x 16.0"

      17-inch Wheel Conversion Chart

      Metric to Standard Tire Conversion Chart for 17 inch Wheels
      Metric Standard
      245/70/17 30.6"x 9.8
      265/70/17 31. 6"x 10.7
      285/70/17 33.0"x 11.5
      315/70/17 34.4"x 12.4

      18-inch Wheel Conversion Chart

      Metric to Standard Tire Conversion Chart for 18 inch Wheels
      Metric Standard
      275/65/18 32.1"x 11.0
      375/50/18 33.0"x 15.4
      325/60/18 33.2"x 13.3
      325/65/18 34.8"x 13.5
      305/70/18 35.0"x 12.2
      375/60/18 35.7"x 15.5
      395/65/18 37.8"x 15.7

      20-inch Wheel Conversion Chart

      Metric to Standard Tire Conversion Chart for 20 inch Wheels
      Metric Standard
      325/50/20 33.0"x 13.2"

      Metric measurement example: 225/70R15

      225 = Section width in millimeters

      70 = Aspect ratio (ratio of section height to section width)

      R15 = Rim diameter

      R = Radial Construction, B = Bias Construction, D = Bias Belted Construction


      Calculations for Measurements

      Tire Width: Section width divided by 25. 4 (Ex: 225 / 25.4 = 8.86")

      Section Height: Tire width times aspect ratio (Ex: 8.86" x 70% = 6.20")

      Overall Diameter: Section height times 2 plus rim diameter (Ex: (6.20" x 2) + 15 = 27.40")

      See all tires here


      Related Articles:

      When Is It Time To Change My Jeep's Tires?

      Choosing The Best Jeep Tires

      How Do You Rotate Jeep Tires?

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      Helpful Tire Info - BUDNIK

      Our chart shows the overall section width, the outside diameter, the sidewall height and the recommended rim width range.

      If your car requires something unique, start with picking the tire for the end of the car that is the most difficult.

      If you’ve mini-tubbed the rear for example, and are going to run a big tire with less brand/tread/size choices, start by figuring out that size and what your options are. Then see if the those tire manufacturers also make a matching tire for your front.

      We’ve included the sidewall height of the tire as a quick way to make sure your front tire doesn’t have a taller sidewall than your rear tire when doing staggered sizes. That’s usually not a good look.

      There is a recommended rim width range for any given tire size with the ideal width usually around the middle of that spread. Some things to consider are how much sidewall bulge you want to see and most importantly, how wheel width affects the tires ride, handling and wear characteristics.

      For grip and even wear the wheel width needs to allow for a good contact patch where the tread meets the pavement.

      A wider wheel tends to make the tire more responsive to steering inputs but also taken to extremes can make the ride harsh because the sidewall doesn’t flex as easily.

      A narrower wheel can give up some of that responsive handling and will tend to give a softer ride because the sidewall has more curve that flexes more easily.

      Budnik Tire Chart     
            
            
      SIZEOverall DiameterOverall (section) WidthSidewall HeightApprox Rim WidthsNitto Tires
      205/40-1723.58.13.37.0-7.5NT01
      205/45-1724.38.13.67 
      205/50-1725. 18.147 
      215/35-1722.98.537.0-8.5 
      215/40-1723.88.53.47.0-8.5 
      215/45-1724.78.53.87.0-8.0 
      225/35-1723.28.93.17.5-9.0 
      225/40-1724.18.93.57.5-9.0 
      225/45-17258.947.0-8.5 
      225/50-1725.98.94.46.0-8.0 
      235/40-1724.49.33.78.0-9.5NT05,NT01
      235/45-1725.39.34.27.5-9.0NT555, INVO
      235/50-1726.39.34.66.5-8.5 
      245/35-1723.89. 63.48.0-9.5 
      245/40-1724.79.63.98.0-9.5INVO
      245/45-1725.79.64.37.5-9.0INVO, NT01
      245/50-1726.79.64.97.0-8.5 
      255/40-17251048.5-10.0NT05,NT555,NT01
      255/45-1726104.58.0-9.5 
      265/40-1725.310.44.29.0-10.0 
      275/40-1725.710.84.49.0-11.0 
      275/50-1727.810.85.47.5-9.5 
      285/40-172611.24.59.5-11.0NT555
      315/35-1725.712.44.311.0-12.0NT05,NT555,NT01
            
      18″Overall DiameterOverall (section) WidthSidewall HeightApprox Rim Widths 
      205/40-1824. 58.13.27.0-8.0 
      215/35-1823.98.537.0-8.5 
      215/40-1824.88.53.47.0-8.5 
      215/45-1825.68.53.87.0-8.0 
      225/35-1824.28.93.17.5-9.0 
      225/40-1825.18.93.67.5-9.0NT05,NT555,NT01
      225/45-18268.947.0-8.5NT555, INVO
      235/35-1824.59.33.29.0-9.5 
      235/40-1825.49.33.78.0-9.5NT05, NT555, NT01
      235/45-1826.39.34.27.5-9.0 
      245/35-1824.89.63.48.0-9.5 
      245/40-1825. 79.63.98.0-9.5NT05,NT555,INVO,NT01
      245/45-1826.79.64.47.5-9.0NT555, INVO
      245/50-1827.69.64.87.0-8.5 
      255/35-1825103.58.5-10.0NT05, NT555
      255/40-18261048.5-10.0 
      255/45-1827104.58.0-9.5 
      265/35-1825.310.43.79.0-10.0NT05, NT555, INVO
      265/40-1826.310.44.29.0-10.0 
      275/35-1826.710.83.89.0-11.0NT555, INVO,NT01
      275/45-1826.710.84.98.5-10.5 
      285/35-1825.911.23.99. 5-11.0NT05, NT555
      295/35-1826.111.64.110.0-12.0NT05. INVO
      315/30-1825.412.43.711.0-12.0NT05,NT01
      335/30-1825.913.2412.0-13.0 
      345/30-1826.113.64.112.0-14.0 
            
      19″Overall DiameterOverall (section) WidthSidewall HeightApprox Rim Widths 
      225/40-1926.18.93.57.0-9.0NT05, INVO
      235/35-1925.59.33.28.0-9.5NT05, NT555,NT01
      235/40-1926.49.33.78.0-9.5 
      245/35-1925.89.63.48.0-9.5NT05, NT555, INVO
      245/40-1926. 79.63.98.0-9.5NT05, INVO
      245/45-1927.79.64.37.5-9.0 
      255/30-19251038.5-9.5INVO
      255/35-1926103.58.5-10.0INVO
      255/40-19271048.5-10.0NT05, INVO
      265/35-1926.310.43.79.0-10.5 
      275/35-1926.610.83.89.0-11.0INVO
      275/40-1927.710.84.39.0-11.0 
      285/30-1925.711.23.49.5-10.5INVO
      285/35-1926.911.23.99.5-11.0INVO
      285/40-192811.24.59.5-11.0 
      295/35-1927. 111.64.110.0-12.0INVO
      305/30-1926.2123.610.5-11.5NT05,NT01
      305/35-1927.4124.210.5-11.5 
      315/40-1928.912.4511.0-12.0INVO
      325/30-1926.712.83.812.0-13.0INVO
      345/30-1927.113.64.112.0-14.0INVO
      345/35-1928.513.64.811.0-13.5 
            
      20″Overall DiameterOverall (section) WidthSidewall HeightApprox Rim Widths 
      225/35-2026.28.93.17.5-9.0NT555
      235/30-2025.69.32.88. 5INVO
      235/35-2026.59.33.28.0-9.5 
      235/45-2028.39.34.27.5-9.0 
      235/55-2030.29.35.16.5-8.5 
      245/30-2025.89.62.98.0-9.0NT555, INVO
      245/35-2026.89.63.48.0-9.5NT555, INVO
      245/40-2027.79.63.98.0-9.5NT555, INVO
      245/45-2028.79.64.37.5-9.0INVO
      245/50-2029.69.64.87.0-8.5 
      255/30-20261038.5-9.5INVO
      255/35-2027103.58.5-10NT05, NT555, INVO
      255/40-20281048. 5-10NT01
      255/45-2029104.58.0-9.5NT05, INVO
      255/50-20301057.0-9.0 
      255/55-2031105.57.0-9.0 
      265/30-2026.310.43.19.0-10.0 
      265/35-2027.310.43.79-10.5NT555
      265/40-2028.310.44.29.0-10.5 
      265/45-2029.410.44.78.5-10.0 
      275/30-2026.510.83.29.0-10.0NT555, INVO
      275/35-2027.610.83.99.0-11.0NT05, NT555, INVO
      275/40-2028.710.84.39.0-11.0INVO
      275/45-2029.710. 84.98.5-10.0 
      285/30-2026.711.23.49.5-10.5NT555, INVO
      285/35-2027.911.23.99.5-11.0NT01
      285/40-202911.24.59.5-11.0 
      285/45-2030.111.259.0-10.5 
      295/30-202711.63.510.0-11.0 
      295/35-2028.111.64.110.0-11.5INVO
      295/40-2029.311.64.610.0-12.0 
      295/45-2030.511.65.29.5-11.0 
      295/50-2031.611.65.88.0-10.5 
      305/35-2028.4124.210.0-12.0 
      305/40-2029. 6124.810.0-12.0 
      315/35-2028.712.44.310.5-12.5NT05, INVO
      335/25-2026.613.2412.0-13.00 
      335/30-2027.913.2411.5-12.5 
      345/25-2026.813.63.412.0-13.0INVO
            
      LT TRUCKOverall DiameterOverall (section) WidthSidewall HeightApprox Rim Widths 
      265/60-2032.510.46.37.5-9.5TERRA
      275/60-203310.86.57.5-9.5TERRA
      285/55-6032.311.26.28.0-10.0TERRA
      285/60-2033.511.26.78. 0-10.0 
      305/55-2033.2126.68.5-11.0TERRA
            
      22″Overall DiameterOverall (section) WidthSidewall HeightApprox Rim Widths 
      235/30-2227.69.32.88.5 
      245/30-2227.89.62.98.0-9.0NT555, INVO
      255/30-22281038.0-8.5NT555, INVO
      255/35-2229103.58.5-10INVO
      265/30-2228.310.43.19.0-10.0INVO
      265/35-2229.310.43.79.0-10.5420S
      265/40-2230.310.44.29.0-10.5420S, NT555
      265/45-2231. 410.44.78.5-10.0 
      275/30-2228.510.83.29.0-10.0INVO
      275/40-2230.710.84.39.0-11.0420S
      275/45-2231.710.84.98.5-10.0420S
      285/30-2228.711.23.49.5-10.5INVO
      285/35-2229.911.23.99.5-11.0420S, NT555
      285/40-223111.24.59.5-11.0420S
      285/45-2232.111.259.0-11.0 
      295/30-222911.63.510.0-11.0 
      295/45-2232.511.65.29.5-11.0 
      305/35-2230.4124.210.5-11.5 
      305/40-2231. 6124.810.0-12.0 
      305/45-2232.8125.49.0-1.0 
      315/25-2228.212.43.111.0-12.0 
      335/25-2228.510.83.211.5-12.5 
      335/30-2228.713.73.312.0-13.0 

      Tire Calculator inches

      American and European tires are distinguished by their markings. European tires have a metric marking system. Therefore, when replacing tires, the problem of translating tire parameters may arise. In most cases, this is the conversion of inches to centimeters. Enter the size in inches and click calculate. You will see the tire size in meters (dimensions will be rounded to European parameters).

      US size
      Metric size
      Rounded to EU

      Comparison: inch and meter sizes

      When you enter the old inch parameters and new European ones, you can see how the external parameters of the tire and ground clearance will change, as well as differences in the speedometer readings.

      Old size: 27293031323335373840 / 8.59.510.511.512.513.514.515.5 R 14151616.517182022
      New size: 145155165175185195205215225235245255265275285295305315325 / /253035404550555606570758085 R 12131415161718192021222324
      Tire width mm (A)
      Profile height mm (B)
      ID mm (C)
      OD, mm (D)
      Speedometer (km/h)
      Real speed (km/h)
      Difference (km/h)

      Ground clearance (mm)

      Metric to Inch Tire Size Conversion (US)

      Thanks to the Tire Calculator, you can do the reverse calculation - convert "cm" and "mm" to inches. To do this, enter the size, diameter, width and height of the tire profile and click the "calculate" button. The calculator will convert the values ​​to inches.

      Attention! This R-metric calculator is used to convert European tire size to US tire size. But you can also use it to convert a tire from "inch" style to R-metric. Some dimensions may not be translated correctly (for example, the metric tire dimensions are 33x12.50x15 when converted to R-metric 318/72 R15, but if you translate the dimensions back, you will see 33x12.52x15). This may be due to minor rounding errors.

      29 inch

      The Russian SUV comes with wheels that are slightly smaller in diameter than a conventional SUV. The standard size of foreign cars is 29 inches or 235/75R15.

      Domestic SUV (Niva) is factory-equipped with 175/80R15 wheels. On such tires, the car quickly burrows into the mud, hardly moves along our impassability.

      To correct this situation, it is necessary to install 29 inch tires. It will increase the clearance by 25 mm. If you install tires 31 inches, the ground clearance will increase by 50 mm. To install such wheels, you only need to change the wheel arches. It will be necessary to increase their dimensions.

      Inch System

      Most Jeeps use tires marked 31x10.5R15.

      31 here refers to the inch diameter of the wheel. One inch, as you know, corresponds to two and a half centimeters, and to be completely accurate, then 2.54 cm. In other words, after the transfer, D will become equal to 78.7 cm. shows the wheel size with the rim parameters already taken into account.

      The wheel diameter 31x10.5R15 is almost equal in dimensions to the tire with the designation 31x10.5R16. The only difference will be a reduction in tire profile by 2.5 cm.

      10.5 - tire width in inches. But this value is not entirely accurate, because when converted from inches to traditional centimeters, it will turn out to be 26. 5 cm.

      However, when measuring this value with a regular ruler, the value will fluctuate within 23 cm. we can talk about a width of 26.5 cm.

      You should always remember this nuance if you decide to install the maximum tire size in the arch of an SUV.

      Metric

      This measurement system is much more difficult to use. Take rubber marked 265-75-15.

      265 mm - tire width. Just like in the inch system, its actual width will be approximately 230-235 mm.

      75 - profile height in millimeters. To get the true value, you need to take 75% of 265 mm. It will be 198.75 mm. This number is then multiplied by two. This is because the total wheel diameter is D of the rim plus twice the profile height.

      In our case, it is 15 inches. As a result, after the calculations, we get a D disk of 381 mm. Total wheel D: 397.5 + 381 = 778 mm or 77.8 centimeters.

      R15 - radial rubber. Disc diameter is in inches. Always a surprise. Why is the inch designation left in the metric system.

      Learn more