If you drive a high-performance vehicle, you might see a V, W or Y (149, 168 or 186 mph). Other light trucks use N, P, Q or R (87, 93, 99 and 106 mph). H (130 mph) is commonly used with passenger cars, SUVs, light pickup trucks, coupes and sports cars. The most common speed ratings for a family sedan, SUVs and van tires are S and T, translated as 112 or 118 mph. This figure relates to the top speed capability you can use the tire at. Tires with higher speed ratings provide more control at higher speeds and can handle heat better. The speed rating or maximum speed rating is another figure that needs to be referenced with the help of a chart. Most passenger vehicles use load indexes ranging from 70-125. As an example, a load capability of 117 means that the tire can handle 2,833 pounds of weight. Instead, you need to reference a chart that shows you what the load index rating means. However, you can’t easily tell how much weight it holds just by looking at this figure. The higher the number of the tire’s load index rating, the more weight you can put on the tires. The load index is the figure used to show the total weight the tire is capable of handling when it is at full inflation. Usually, this figure is listed in inches, such as 17 inches from our example, P225/65R17. The measurement is determined by figuring out the space across the center, from one size to the next. This figure shows what size wheel should be used with the tire. The final number in the sequence is the diameter of the wheel or rim diameter. It’s important to know what size wheel the tire is meant for. This letter is only found on run-flat varieties. You will find this type most commonly used with trailer or motorcycle tires.Īdditionally, some tires feature an “F” before the construction letter. These are otherwise referred to as Bias-Constructed Tires, Bias Ply or X-Ply, Cross-Ply and Conventional Tires. There can also be tires with a “D,” standing for Diagonal Piles. This design provides the smoothest ride and longer tread life. These tires are the most common on the road and are made by assembling piles of fabric, steel, and polyester, along with coated rubber, lying perpendicular to the direction the tire travels. This letter signifies that it is a Radial Tire. Most passenger tires feature an “R” after the aspect ratio. The higher the number is, the longer the response time when turning, while the lower number indicates a faster response to a command. This figure determines how well the vehicle handles your tires. It shows that the height of the tire is equal to 65% of the width. In the example used above, P225/65R17, the 65 is the aspect ratio. This two-digit number is found after the slash symbol in the tire size. The aspect ratio of a tire is the height of the cross-section compared to the width. Aspect RatioĪfter the slash mark, the next number you will see is the tire’s aspect ratio. As an example, if your tire size is P225/65R17, the width of the tire would be 225 millimeters. In the tire size, the first three numbers refer to the width of the tire. This measurement is given in millimeters, based on how much room there is between each sidewall. This can also be referred to as the section width. Euro-metric tires are similar to our Passenger tires. If this is the case, it might have been made in Europe. However, there’s also the chance that there’s no letter on the tire. There are also other types that are used, such as “T” for Temporary, “ST” for Trailer and “C” for Commercial. Tire manufacturers design these for the higher inflation needs required by some trucks. If you see the letters “LT” instead, it means Light Trucks. This letter signifies that it is a P-Metric tire designed for the standards of passenger vehicles. WOW That ones in a very nice condition.I have one and have just cleaned it up after finding it in an old rubbish dump years ago and found the inscription.Ĭreate an account or login in order to post a comment.Most car tires have the letter “P” at the front of the tire size. Schrader's Son" was a typo and that it was meant to be 'Schrader & Son' but I'm gathering that it really meant his son took over the company at some point. It's got the same patent dates as the one in the photo.Īnd I always assumed the "A. The one I have has the number '63335' etched on it. Love it, I bought a couple of these this summer, they were in a box with a bunch of other smalls.Īny idea about whether or not the serial numbers indicate the date of manufacture? Here's the one, where the discussion was taking place: We were comparing these and their dates, this one might fall in to the order of mfg. Thanks for sharing, I believe, well I know, there are several others posted.
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