what does the speed rating of a tire mean?
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Tire Speed Rating Explained What Is Meant by Speed Rating? The speed rating of a tire indicates the speed category (or range of speeds) at which the tire can carry a load under specified service conditions. The speed rating system used today was developed in Europe in response to the need to control the safe performance of tires at standardized speeds.
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- A service description identifies the tire's load index and speed rating. Service descriptions are required on all speed rated (except for Z-speed rated) tires manufactured... The Tire Rack describes how to read speed ratings, load index and service descriptions.
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Speed Ratings While a Z-speed rating still often appears in the tire size of some tires, such as 225/50ZR16 91W, the Z in the size signifies a maximum speed capability in excess of 149 mph; the W in the service description indicates the tire’s specific 168 mph maximum speed.
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How To: Read a Tire Sidewall A preceding “Z” is simply a reference to an outdated and vague speed rating of more than 240 km/h, or 149 mph (the specific rating can be found in the service description). 4.) “18”: This number indicates the diameter of the wheel on which the tire should be mounted, generally in inches.
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"What Is a ""W"" Speed Rating for Tires?" A W speed rating on a tire indicates that the manufacturer produced the tire for use on exotic sports cars. The W rating gives the tire a maximum speed capacity of 168 miles per hour. Continue Reading.
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H-Rated tires with shorter life spans become more common Speed ratings indicate the highest speed a tire maker considers safe for that tire to travel and is designated by letters such as Q, S, T, H, V, and Z along with the tire size information on the sidewall. All these ratings cover speeds well above legal limits.
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- You might also find it in the driver’s side door jamb, the gas tank hatch, or inside the glove box door – anywhere that lists the right tire code for your vehicle. Speed rating is easy to locate because it’s usually the last item in the character sequence in the tire’s size code. For example in this tire code: “P205/60R16 82S,” S is the speed rating. To view the tire size code for your current tires, just look at the sidewall.
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Uniform Tire Quality Grading Tire Ratings-Traction grades Traction grades are an indication of a tire's ability to stop on wet pavement. A higher graded tire should allow a car to stop on wet road … s in a shorter distance than a tire with a lower grade. Traction is graded from highest to lowest as AA, A, B, and C.
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A Simple Explanation of Tire Speed Rating A tire’s speed rating indicates the optimal speed that the tire can safely maintain over time. The higher the speed rating, the better control and handling you’ll have at higher speeds. The speed rating system was developed to help control the safe performance of tires at standardized speeds. A tire’s certified speed rating is given a letter from A to Z, ranging from 5 km/h (3mph) to above 300 km/h (186 mph). This rating system (see below) shows the top speed for which a tire is certified.
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How new tires can ruin your car For instance, if your car came with V rated tires, meaning they're designed to handle speeds up to 149 miles per hour, you might safely replace them with H rated tires designed to go only 130 mph, he said. You might get a lower price and a more comfortable ride, just be sure you're not going to drive aggressively.
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- Many vehicles provide a minimum required speed rating, which should be considered when buying tires since a lower speed rating can be potentially dangerous because it’s not made to withstand the same speeds. Please be careful when choosing a different speed rating than suggested by your vehicle’s manufacturer.
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What Are Tire Speed Ratings? These two ratings provide a better indicator of the tire's capacity for speeds higher than 149 MPH. The Z, W, and Y, ratings appear on tires for sports cars, exotics, or other vehicles engineered for ultra-high speeds. H is the only speed rating that doesn't appear in alphabetical order.
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- SPEED SYMBOLS. The speed symbol determines. the maximum speed allowed for. the rated loads of the tire. From. the table above, A8 means the. maximum speed allowed for the. rated load of the tire is 40 km/h. or 25 mph.
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Q Speed Rating Understanding Speed Ratings. …168 mph, 270 km/h maximum speed. You can learn more about speed rating and the other letters and numbers on the sidewall of your tire in How to Read Speed Rating, Load Index & Service Descriptions.. Disclaimer: It is important to note that speed ratings only apply to tires that have….
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- For example, a tire rated “L” is good for a lower maximum sustained speed than one rated “N.”. But the tire speed rating system isn’t without its quirks. For instance, the system’s European roots give it unusual mile per hour maximums. Another such quirk is that the letter “H” is out of place. Instead of appearing after “G,” it falls between “U” and “V” as does the speed to which it corresponds.
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"Speed Ratings: ""Sustained"" Speed? 2" I understand that tires are speed-rated according to their relative capability to withstand certain sustained speeds. I suppose heat and pressure build not only as the speed increases, but also as the time duration (at that speed) increases...up to a point.
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Too Fast for Your Tires? With most on-highway truck tires now rated for 75 mph (speed rating L for the ISO LI/SSY rating), 75 should be a safe speed for tires if the correct pressure is maintained. Speeds above 75 may require additional pressure or reducing the load on the tire.
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- While a Z-speed rating still often appears in the tire size designation of these tires, such as 225/50ZR16 91W, the Z in the size signifies a maximum speed capability in excess of 149 mph, 240 km/h; the W in the service description indicates the tire's 168 mph, 270 km/h maximum speed. service description identifies the tire's load index and speed rating. Service descriptions are required on all speed rated (except for Z-speed rated) tires manufactured since 1991.
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Decoding Tire Code: Load Index, Speed Rating, and M+S Designation This week, we will examine the rest of the code. The tire performance index is displayed after the wheel diameter, and represents the tire’s load and speed ratings. In this case, the 93 load index represents 1,433 pounds, and the speed rating of V represents 149 mph. Letter. Max.
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Speed Ratings In situations where tires having different top speed ratings are mixed on a vehicle, the maximum speed certification is limited to the top speed certification of the tire with the lowest speed rating. Speed ratings do not indicate how well a tire handles or corners.
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- Speed rating ensures that a vehicle’s tires match its top speed capability. Going back to our Audi, the “H” speed rating is equal to 130 miles per hour, meaning that under optimal conditions**, the tire can perform at speeds up to 130 mph. Now just a second, leadfoot … that doesn’t mean you should drive 130 mph.f necessary, you can use a tire with a speed rating that is greater than the speed rating recommended for your car (for example, instead of using an H-rated tire on the Audi A3, you could use a V-rated tire (149 mph).
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- AERO quARTERLy qTR_02 | 09. limit is the ground speed, which is usually. expressed in statute miles per hour. This. means that a tire rated at 235 miles per. hour is designed for a maximum ground. speed at liftoff of 204 knots. A number of factors can lead to a tire-.
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Flat Tire Repairs' Effect on Speed Rating The origin of tire speed ratings can be traced to Europe where they were needed to match high-speed tire durability with the unlimited vehicle speeds permitted on roadways like the German Autobahn.
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- Speed Rating Z. A “Z” rating can mean different things. While it nearly always means a high performance tire for high-performing sports cars, “Z” may actually appear in the middle of a tire’s size information. When it does, it represents either a maximum speed of more than 149 mph (240 kph) or 186 mph (300 kph).peed rating is easy to locate because it’s usually the last item in the character sequence in the tire’s size code. For example in this tire code: “P205/60R16 82S,” S is the speed rating. To view the tire size code for your current tires, just look at the sidewall.
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- Z-speed rated tires. …tires were all Z-speed rated. They were tested at some speed above 149 mph. In order to be more precise, tire manufacturers started testing at 168 mph (W-speed rating) and 186 mph (Y-speed rating).In the above picture you'll see 91W to the right of the size.The W of the 91W means the above Yokohama….Zr Speed Rated | Z Rated Tires | Zr Rating.n order to be more precise, tire manufacturers started testing at 168 mph (W-speed rating) and 186 mph (Y-speed rating). In the above picture you'll see 91W to the right of the size. The W of the 91W means the above Yokohama…. Zr Speed Rated | Z Rated Tires | Zr Rating.