The Speed Rating is explained in detail here. The aspect ratio is the same as for alphabetical sizes and is defined above. The Section Width is the width of the tire measured from the middle of the side walls (above the bead, below the tread). In that case the size would look like this 120/70-17Z. Some manufacturers put the speed rating at the end of the size and do not indicate if the tire is tubeless or not. It can also be written as 120/70Zx17TL or 120/70ZR17TL. The tire size we will use for our example is a 120/70ZR-17TL. The vast majority of tires manufactured and sold today come with metric sizing. When I find an adequate explanation, I will put it here. I have so far been unable to find a complete description and value set to explain the Load Range. Rim Size or Diameter is the outside diameter of the rim, also called the wheel size. Multiplied by 100 to give you a whole number for the tire. The section width is measured from the middle side walls (above the bead, below the tread). The tread width is usually greater than the section width. The section height is measured at the center of the tire crown. The Aspect Ratio is the tire section height divided by the section width (not tread width), multiplied by 100. You can also contact the manufacturer of the tires you want to put on your bike. Wrong selection can result in tire failure, loss of control with serious injury or death. non-radial, pattern and tread compound requirements, inflation recommendations, and front-to-rear tire matching will all vary with tire selection. Consult your motorcycle’s manual or manufacturer’s customer serviceĭepartment for correct replacements for original equipment tires.Ĭritical clearances, motorcycle compatibility and stability, load-bearing capacity, speed rating, radial vs. They are to give you a point of reference when upgrading your older tires. The above tire size conversion chart does not mean that these tires are universally interchangeable. 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. The way to be sure your tires are the right fit is to ask your local Les Schwab pro.What do these terms alphabetical, metric and std inch mean? They are explained in a section below. These calculations (and those provided by all online tire dimension calculators) don’t account for these variations. A tire’s true physical size can vary from the dimensions provided by the tire manufacturer, and this tool does not take into account other important application factors like load index and speed rating. We don’t recommend that you base sizing or purchase decisions on the calculator alone. Our tire size calculator is for general comparison purposes only. It will also tell you the difference in tire speed between your comparison tires.Īs a general rule, you want replacement tires that are within 3 percent of the diameter (height) measurement of your existing tires’ diameter - assuming your current tires are what your owner’s manual recommends. Our tire size calculator converts metric measurements to inches so you can easily compare the diameter, width, sidewall, circumference and revolutions per mile.
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