A tyre's load index is a number that can be used to look up the maximum amount of weight that a tyre can bear at its speed rating when inflated to its maximum pressure. The speed rating is denoted by an alphabet placed to the immediate right of the load rating, towards the end of a tire’s sidewall code. Tyre Advice - December 10 2018. Q. Remember: the speeds are test speeds, not recommended speeds. Inflation Pressure - PSI. The load rating is generally found after the diameter reading and before the speed rating on the sidewall marking: Tyre Load Rating Table. P — Up to 93 mph. Tire sizes listed with 2.00, 2.25 or 2.50 as the first number (section width in inches) are rated for no more than 75 MPH. 30. W* 168. When your old tyres are worn off and you need to go for a new set of tyres, then you should always follow the instructions given in the user manual of the manufacturer. Tyre load index chart in Europe in response to the need to control the saf. 3. A tyre marked with a ‘Y’ speed rating, indicates it can be safely operated at a maximum speed of 300kph. Q. The Load Index is an assigned number ranging from 0 to 279 that corresponds with the maximum load carrying capacity of a tyre. The SPEED SYMBOL indicates the maximum speed at which the tyre can carry a load corresponding to its Load Index under service conditions specified by Avon Tyres. Note: Just because your tires can go up to a certain speed does not mean that your vehicle can nor that it is safe to do so. Indicated by a letter, each rating corresponds to a specific speed. According to these regulations, winter tyres may have their speed rating lower than recommended by the manufacturer, but not lower than index Q (Q = 160 km/h). 10 … See the chart in the tire’s description on our website for information for that particular tire’s speed ratings. The Speed Index is an assigned letter ranging from J to Z that corresponds to the reference maximum speed at the associated load index. Tire Speed Rating Chart V. 149. But it might if it is run at that speed for an extended time. To receive its rating it must demonstrate that it can sustain a particular speed when tested with simulated loads. Using the tire speed rating chart below, we can see that a tire with a Y speed rating can safely go up to 186 miles per hour (mph)—the fastest speed on the chart! Service description speed symbol. In order to give drivers and government authorities an indication of a tire’s ability to withstand the stresses associated with elevated speeds, the speed rating … Tireire Speed-RatingSpeed-Rating System The speed-rating system in use today was developed. W and Y-speed tires were innovated later as cars got faster with the help of technology. The speed rating of a tyre is displayed on the sidewall. R. 106. Maximum Speed Rating, Maximum Tire Pressure, and Maximum Load Rating You can drive faster than the maximum speed rating but in order to do that, you need to increase your cold inflation pressure by about 10 psi (without exceeding the maximum PSI stamped on the tire) for every 10 mph over 65 that you are driving, as well as devalue your load carrying capacity by 10%. Above 149. Obey all speed limits. So let's look at how these numbers translate to a real tire. Tire speed ratings range from A (the lowest) to Y (the highest). Obey all speed limits. The load index for passenger car tyres normally sits between 60 and 110, which equates to 250-1060kg/tyre. Uniform Tire Quality Grading, commonly abbreviated as UTQG, is the term encompassing a set of standards for passenger car tires that measures a tire's treadwear, temperature resistance and traction.The UTQG was created by the National Highway Traffic Safety Administration in 1978, a branch of the United States Department of Transportation (DOT). …85% 42.5 850 Note: Never exceed the maximum cold inflation pressure branded on the tire's sidewall. V. 149. An "H" speed rating signifies that this tyre can be run safely at speeds of up to 210 kph for extended periods. The SPEED SYMBOL indicates the maximum speed at which the tyre can carry a load corresponding to its Load Index under service conditions specified by Avon Tyres. Here is a tyre speed rating chart to help you choose the perfect set of tyres: Code http://tirespeedratingchart.com Looking for a tire speed rating chart? Tyre Speed Rating Chart. A typical load rating chart shows 47 or 386 lbs all the way up to 87 or 1,202 lbs. When speed ratings first came out, Z was thought to be the highest speed rating you could get, so tire manufacturers put them on every tire and it became cool to have Z-rated tires. Speed Rating W. A relatively new addition to the speed rating chart, tires with speed rating “W” can achieve a maximum sustained speed of 168 mph (270 kph). Not all manufacturers produce tires in all speed ratings. The tyre load index table displayed below shows the load rating for both single wheel and dual wheel configurations, for example 121/120 = 2,900 single, 5,600 dual. Tire Speed Rating Chart In this page you will find tire speed rating chart with maximum speeds in MPH and KMH, tire pressure and also tire load adjustments for high speed driving. If you are looking for Pirelli tire with a speed rating of N, just give up. Speed ratings are based on laboratory tests in which the tyre is run at 6.2 mph steps, in 10 minute increments, until the required speed has been met. Charts. They begin with a maximum speed of 118 mph (190 kpm/h) and increase from there. See speed rating chart below. For example, P235/75R15 or LT215/65R15. "Z" Ratings A tire's load index designates the maximum load carrying capacity of a tire at maximum air pressure and speed. Using P215/65R15 85H as an example, the 85 gives the load index, also called the tire ply rating, and the H is for the speed rating, which tells you the maximum speed at which you should use the tires. S. 112. 124. In Europe, some highways have speed limits higher than those in North America – and a few have no limits at all. Most passenger vehicle load indexes range from 62 to 126. The following table shows the weight that each index specification is able to carry: Buy Tyres Online. For example, many Honda Accord vehicles have V-rating tires from the factory, which gives a 149 mph top speed on the tire. Note: A letter “Z” indicates maximum speed capability in excess of 149 mph and is usually displayed after the aspect ratio. Sport Sedans, Coupes & Sports Cars. The speed capability of the vehicle will become limited to that of the lowest speed rated tires. But tire makers test their own tires and assign their own speed ratings. The speed rating for all tyres will become that of the lowest speed-rated tyre on the vehicle.Opposite is a list of speed ratings along with the corresponding speeds they represent. Will it explode if it goes to 220? On the sidewall of every tire, you'll find one of these speed rating codes: M — Up to 81 mph. 149 mph +. U. The rating is standard on the majority of family cars, as due to modern engine technology, most 1.5 – 2.0 litre cars are capable of speeds above 110 mph. As seen in the tyre speed rating chart below, V corresponds to 149 mph. This is good information to have for a number of reasons, some of which actually include the likelihood of you ever being able to sustain even the lowest of speeds that passenger car tires are rated for. They begin with a maximum speed of 118 mph (190 kpm/h) and increase from there. For maximum speed, you need to associate this letter with the table of speed ratings below. 99. For example, if your tyre’s sidewall markings were 235/45R18 98Y, the last section of the sidewall markings ‘98Y’ indicate the load index and speed symbol. Please note that this is the speed rating chart example used for instructional purposes. The speed rating is a measurement of the speed at which the tyre is designed to run for extended periods. R. 106. A tire's capabilities are tested at preset speeds and the results of these tests determine the tire's speed… For example, a tyre grade of 200 should take twice as long as the control tyre to wear out. Most passenger car tyre load indexes range from 62 to 126. 3. This tire doesn't list P or LT, so it's a passenger tire. H. 130. The speed rating is generally mentioned on the sidewalls of a tyre and is denoted alphabetically. Common Tyre Speed Ratings Chart. In this case it’s a V rated tyre this indicates the speed rating. The speed rating of a tyre represents the maximum speed the tyre can reach. Maximum speed (MPH) Size speed symbol. H. 130. Speed ratings are based on tests in which engineers run the tyre at 6.2 mph steps, in 10 minute increments, until the required speed has been met. Tire Size. So in this example, the tyre profile height is 55% of the tyre width (180 mm), making it 99 mm. TIRE LOAD LIMITS (LBS) AT VARIOUS COLD INFLATION PRESSURES (PSI) FOR ST TRAILER TIRES USED IN NORMAL HIGHWAY SERVICE. To be honest, Z-rated used to mean a lot more than it does now. A ‘standard' control tyre is assigned a grade of 100 and the treadwear rates of all test tyres are compared to it. It describes the top speed for which a tire is certified. For tires with a maximum speed capability higher than 240 … A chart denoting tire speed rating codes is an essential reference when buying new wheels for your automobile. Tyres with a ZR rating have a speed capability of over 240 km/h. Refer to the below charts to find your tyres load index and speed rating. Are you wondering what are your tyres' speed rating or load Index? The tire speed rating is the maximum speed tires can safely carry a load (the original weight of your vehicle plus whatever’s in it) for a sustained amount of time in ideal conditions. The rating is molded on the tire sidewall, signified by a letter or two, usually after the load index number. 2. Learn how to prepare your motorcycle with Michelin's experts and stay safe on the road. This speed ranges from 3 mph to 186 mph. Learn how to prepare your motorcycle with Michelin's experts and stay safe on the road. Caution. The speed ratings are established by engineers who run the tyres in ten-minute increments until the desired speed has been met. OLD SYSTEM. It’s shown as a letter after your size in the picture. The digits (98) represent the tyre's Load Index and the single letter (T) identifies the tyre's speed rating. The different seasons affect your tyre's speed ratings. Letters ranging from A to Z represent the speed rating. This tyre pressure placard sticker was taken from a Speed Rating Conversion Chart and the tyre pressure placard lists standard air pressures, laden tyre pressures and in some cases even have an "Eco" (Economical driving) setting. We feel that being able to drive up to 130 mph is more than enough speed rating for everyday use. The speed rating code is semi-alphabetic and goes like … In other words, it’s the amount of weight your tire can support safely. How is the speed rating calculated? The speed rating is displayed on the tyre’s sidewall, after the load rating. Where do I find the tyre speed rating? Load Index Chart. 99. The speed rating is generally mentioned on the sidewalls of a tyre and is denoted alphabetically. Subscribe. The speed rating is on the tire sidewall. Remember, the speeds are test speeds, not recommended speeds. 35. The tyre’s speed rating represents the top speed the tyre is capable of maintaining. Tire speed ratings range from A (the lowest) to Y (the highest). Q. See the full list below. S. 112. The TyreReview team! These speeds are shown in Table 1 and apply to tyres when in good condition, inflated to the correct pressure, operating within their specific load capacity and fitted to the correct size rim. Ratings can start from as low as B, indicating 31MPH up to Z which can reach speeds of 150MPH for specialist performance tyres used in racing. 4wd Offroading. The second letter, Y, refers to the speed symbol of the tyre. Load & Speed Ratings. For example, H is between U and V, with the common perception that H stood for “high performance” at one time. In earlier incarnations of the speed rating system, “H” stood for “high performance,” which is why it maintains an unusual position in the speed rating spectrum today. Once the highest speed rating a tyre could have, “V” used to represent a maximum of 240 km/h or more. Nowadays, it means 240km/h but no higher. Tyre Speed Rating Conversion Chart Above is an image of the Speed Rating Conversion Chart tyre pressure placard. A typical speed chart will show J or 62mph all the way to W which is 168mph. Load Index Chart Speed Rating Chart Tread Style Guide Tire Inflation Calculators Tire Manufacturer Databooks. In this video I tell you about one of the better ones. The U.S. Department of Transportation (DOT) set the ratings scale, shown below. THE ORIGIN OF SPEED RATINGS. Load ratings range incrementally from 62 (265kg) to 126 (1,700kg). the letter "T" defines the maximum speed limit at 190 kph/118mph (Please see the tire speed rating chart below). For speeds in excess of 210 kph consult with tyre retailer. The chart shows a list of speed ratings, along with the corresponding speeds they represent. The lowest rating, L, is 75 mph. Most boat trailer tires have a load range of B, C, or D. If a tire has load range C, it can carry 1,820 pounds. ZR (Y)** Above 186. It is the last letter of the code of the characteristics of the tire, for example the code W: 255 / 40R17 94W indicates its rating. The 265 means the width is 265 millimeters or 10.4 inches wide. Tyre Speed ratings use letters that correspond to a particular speed. Traction grades are an indication of a tyre's ability to stop in the wet. To understand the actual meaning of the code, you need to read a tire speed rating chart. This number, which is usually between 75 and 100 for passenger cars, is not stated in pounds or any other unit of measurement. When the letters “ZR” are included in the tyre size and followed by a service description, the tyre speed category is that included by the service description. Notice that Z comes right before W and Y. That’s because Z-speed tires were meant to represent speed ratings higher than 149 mph. 2. They do not make tires with an N rating.

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