The 78-series alpha numeric tires should be replaced with today's 80-, or 75-series tires. Find your tire size instead. That isn't the case, of course. Initially, the tire size simply reflected the equivalent of its outer diameter, expressed in inches or millimeters (e.g. Related articles: Find out what is Plus Sizing. To convert alpha numeric tires to P-metric sized tires, it is important to identify the original tire's aspect ratio. Issues started appearing when rims having different widths were introduced on the market, because these rims required tires with a bigger baloon, that subsequently influenced their size. The calculator will instantly convert the data into the required standard and display it on the screen with the tire size visualizer. In addition, it provides actual speed versus speedometer readings if the tire sizes are different. Tire Size Conversion Chart - Metric to Inches - by Rim/Wheel Diameter displays the metric tire size designations and for each metric tire size designation shows the equivalent - exact calculated inch tire size.. Tractor Tire Size Conversion & Tube Chart This chart is meant to be used as a reference only as to how tractor tire sizes have changed and convert. The tool can be useful for finding out whether or not an alternative tire size is compatible with your vehicle. From standard bias ply sizes such as 6.70-15 to Alpha Numeric sizes like F70-15, all the way up to modern P-Metric sizing, such as 205/75R15. Tire Size Conversion Chart - Inches to Metric - by Wheel/Rim Diameter displays the inch tire size designations and for each inch tire designation shows the equivalent - exact calculated metric tire size. You have no items to compare. Learn about a Tyre Size Designation. Some charts show comparable sizes, but it is better to get the actual measurements first. This calculator provides tire conversion details in both metric and standard units for a given tire. Follow Us. Convert P-Metric tire size to Tire Diameter in inches. Clear All. Remove This Item; Compare . Can't find your version/option? Locate this measurement on the tire size chart included in the Resources section, and the diameter that is displayed next to the measurement size. Reference. Use the following chart to figure out the closest modern tire size to your car's original tires. Example: The size of the tire … (mm) field. So, the sidewall height of a The 3rd number (generally preceded by an "R") is Rim Diameter in inches. Use our handy online calculator to get a list of the ones that will fit your vehicle. 15-inch Wheel Conversion Chart . Select the tire sizes to compare to your stock size and click 'Compare Selected Sizes'. Vintage Tire Size Conversion Chart. Step 1. 26”, 27”, 700mm). If you run bias tires during field operations you can simply change to radial tires or to the “IF” or “VF” to reduce ground pressure as well as increase traction. Perform tire size conversion from the inch tire size to the metric tire size and the other way around with the tire size converter. Finding your tire size is simple. Vintage Tire Size Conversion Chart Use the following chart to ﬁgure out the closest modern tire size to your car's original tires. Tire sizes can be a bit confusing, as the size designations changed a lot over the years. For example, when replacing a FR78-14, you would look up the appropriate 75-series size, the 205/75R14. Tire Calculator Notes: Tire diameter can vary slightly for each tire model. Identify the bias-ply tire's diameter. It allows the user to compare two different tires. Diameter. Classic car websites often have a chart showing the different tire sizes and their measurements (see Resources). What size tires do you need? Supports tire sizes in metric and inches. Shop online at Canadian Tire and pick up at any of 500+ locations Keep in mind these are close approximations and may not be exact replacements. We can't find products matching the selection. Try searching by your vehicle's tire size instead. Welcome to OnlineConversion.com. Before purchasing any tires you should compare outside diameters and the tread footprint to get a better idea on how close a match they are. Find the chart that gives the actual measurement for an F78-14 tire. Tire size calculator compares diameter, width, circumference and speedometer differences for any two tire sizes. Pros and cons of the Plus sizing. 305/50R20 tire conversion. The sizes in the above chart do not go as large as modern sizes (180/55 or 240/40) because new bikes are not made to use the Inch Format.. Wheel Size . A ISO tire size of 28-622 is how we would refer to a 700 x 28C tire has a tire width of 28 mm and a rim diameter of 622 mm. Once you are at your vehicle, write down the following highlighted numbers located on your sidewall in the order shown below. Use the below chart to find the closest modern tire size to your car's original tires. By converting the 225mm to inches (225 / 25.4 = 8.86") and multiplying it by 50% (.50) we confirm that this tire size results in a tire section height of 4.43". Jen; March 23, 2017 ; Tweet; Metric to Standard Conversion. The 2nd number is used to calculate the sidewall height or "aspect ratio" , by percentage. If replacing a FR70-14, you would look up the appropriate 70-series size, the 215/70R14. Converting bias-ply to P-metric tire sizing is not difficult. 285/75 R17) / R. Calculate. Use this tool to compare two tire sizes. Keep in mind these are close approximations and may not be exact replacements. Millimeter (MM) Centimeter (CM) Inches to MM Converter. The listed diameters are from calculations based on the tire size. Diameter (MM) Estimated Wheel Circumference/Computer Setting. Converting tire sizes to reduce compaction can help by reducing ground pressure from your equipment. The first number is the tire width in millimeters. The bias-ply measurement is printed on the original tire or in the original specifications for the vehicle. F78-15 tires were of bias-ply construction. Use our Tire Size Calculator to find the suggested tire size specs for your vehicle. If your wheel size isn't listed in the drop down, you can just enter the number into the Dia. Step 2. All you need to do is to fill in the form with your tire dimensions, click on the convert button, and you're done. If a wider tire is desired, 215/70R15 or 235/60R15 will provide the same diameter, but wider wheels will be required. You'll find that we have most wheel sizes listed so that you can be confident when ordering your spare tire cover. They are explained in a section below. Tire Size Calculator. Click on this easy to read tire size chart so that you can get the correct size tire cover or RV tire shade. The Metric Tire Conversion Calculator converts metric tire sizes (ie 285/75R16) to standard tire sizes (ie 31x10.50R15) and standard tires back to metric. * When replacing Alpha Numeric tires with Euro-metric or P-metric tires, look for the Euro-metric or P-metric size listed in the equivalent aspect ratio. Fortunately, you can do it in no time flat with the help of our tire size conversion calculator. Automotive tires are described by an alphanumeric tire code (in American English and Canadian English) or tyre code (in British English, Australian English and others), which is generally molded (or moulded) into the sidewall of the tire. Immediately available tire sizes that are with in plus or minus 3% variance will be displayed. If you are confused about the metric system of the tire size, you can convert them into inches. Tire Size and Comparison Calculator Calculate tire diameter from code and compare speedometer differences for tire sizes. What do these terms alphabetical, metric and std inch mean? (mm) Tire Size. Tire Size Comparison Calculator. Compare Products. Enter the metric size (i.e. Tire sizes can be confusing to the consumer since the information molded into the side of the tire seems to be a cryptic string of numbers that only a tire technician can decipher. Tire Size Conversion Chart Shop by Size 1949 to 1964 1965 to 1970 1970 to 1980 1960 to Present 1980 to Present NUMERIC ALPHA NUMERIC* EURO-METRIC P-METRIC EURO-METRIC or P-METRIC "90-" to "80"-series 78- to 50-series "82"-series 80-, 75-series 70-series 65-series 60 … From overall diameter to revolutions per mile, you’ll also be able to compare tire sizes and learn the proper height, width, and fit when converting tire sizes. Here are some of the common metric measurement of dirt bike tires into inches: Metric: Inches: 120/90×19: 5.10×19: 110/90×19: 4.50×19: 100/90×19: 4.10×19: 140/80×18: 5.60×18: 130/80×18: 5.30×18: 120/100×18: 5.10×18 : 110/100×18: 4.50×18: How to Choose The Dirt Bike Tire Size. Check out the Charts: Tyre size chart, Tyre conversion chart, Tyre speed rating, Load index . Convert 305/50R20 tire size to inches and compare prices on available tires from the top brands online. Radial and bias ply tires should not be mixed on the same vehicle. Locate an online tire size conversion chart. 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