The load index symbol indicates how much weight a tire can support, based on the following standard chart (see below). The two-digit or three-digit number that follows the gap specifies tire load index. It’s the distance between the two bead seat areas (where a tire gets tightly sealed onto the wheel). This two-digit number specifies wheel diameter in inches. Some motorcycle and trailer tires still use this internal construction. They are also called conventional, x-ply, or cross-ply tires. D: Diagonal Plies or Bias-Constructed Tiresĭ is for tires built with diagonal (crisscrossed) plies, called bias-constructed tires. In a radial tire, the plies - layers of strong cords made of a blend of polyester, steel and fabric and coated with rubber - are laid perpendicular to the direction of travel. They have better road grip, lower rolling resistance for better gas mileage or electric range, ride comfort and durability than previous generations of tires. R is for radial tires, the industry standard for most tires today. This single letter tells you about the internal construction of the tire. This gives you an answer of 5.5, the sidewall height in inches. To get the sidewall height, take the tire width of 215 mm and convert it to inches (8.46). In this example, the aspect ratio is 65, meaning the sidewall is 65 percent as high as the tire is wide. It’s the height of the sidewall measured from wheel rim to top of the tread, expressed as a percentage of tire width. The aspect ratio is indicated on the tire sidewall as a percentage. The bigger the aspect ratio, the higher/taller the tire’s sidewall, or “profile” as it’s sometimes called. The forward slash separates the tire width number from the two-digit aspect ratio. This may also be referred to as the section width. The three-digit number following the letter is the tire’s width (from side to side, looking at the tire head-on) in millimeters. Confused by all the numbers and letters? The pros at Les Schwab can help. It’s also measured in millimeters but may have a different load capacity than a P or LT tire. If there’s no letter before the first number, you have a metric tire most commonly referred to as European size. These tire sizes are meant for trailers, including fifth wheels and other travel trailers, as well as boat and utility trailers. These are often equipped on three-quarter or 1-ton trucks and SUVs. LT means light truck tire, designed for vehicles capable of carrying heavy loads, towing trailers, or for those looking for an extra heavy-duty option.While the right load capacity can be achieved for electric vehicles with a standard passenger vehicle tire, special EV tires may be available for some vehicles. P-class tires include cars, SUVs, crossovers, minivans and smaller pickup trucks, as well as EVs (electric vehicles). This is just a small selection of the wide array of cool motorcycle tires we stock and ship daily. Very handy when choosing which tire will fit your bike, or which motorcycle rear fender to buy to fit the tire you want to run on your new build! The following chart shows some common tire sizes, including their width and the diameter. This is helpful to know what tires you can mount on your rim based on the manufacturer's specs. Motorcycle Street Tire Sizes Conversion Chartīritish motorcycle rims (Triumph, BSA, Norton etc.) are marked with a letter and number designation. This chart shows the approximate comparison of the different size indicators. It is helpful to know how these compare with each other so you can compare different brands of tires and see which might be the best fit for your bike. Size may be indicated in inches, metric, or by letters (alpha). A 170/80 means the width is 170mm, and the height would be 80% of that. In metric this is a ratio between height and width. The smaller the number the lower profile of the tire. How to Read Motorcycle Tire Sizes?ī- Aspect Ratio. Inner tubes are common, though tires are also run without tubes on many modern motorcycles with mag wheels. They help protect the inner tube from a potential puncture from continual wear against the spokes. Rim strips are rubber strips that go around the rim, covering the inside edges of the spokes, before the tire is mounted. The motorcycle tire size will also indicate what size rim strip and motorcycle inner tube is needed. These motorcycle tire sizes comparison charts below will help you understand the codes on the side of your tires to be sure you know which tires you are currently using, and which others will fit your motorcycle. To most people, the numbers and letters on the side of their tires are cryptic and indecipherable.
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