Trailer Tire Speed Rating Chart
There are many other speed codes.
Trailer tire speed rating chart. Tire load limits lbs at various cold inflation pressures psi used in normal highway service. A rating corresponds to maximum performance speeds of 3 mph and Z. While it is possible to buy Special Trailer ST tires with a tire speed rating of 80 MPH some ST tires put on travel trailers and RV fifth wheels by manufacturers have a maximum tire speed rating of just 65 MPH.
Our goal is to help you understand this rating system. Speed Rating and Load Index. 22 rows SPEED INDEX also called speed rating of a tire is the rating it has been designed.
Tires with a maximum speed capability higher than 300 kmh 186 mph require a ZR in the size designation. Unlike automotive tires all ST tires are tested and rated at by the DOT at 65MPH. Trailer tire speed ratings do use a letter code system.
Thats because Z-speed tires were meant to represent speed ratings higher than 149 mph. The Taskmaster radials like the part C22515D which is an ST22575R15 like you mentioned has a speed rating of 81 mph. The highest rating Z is 149 mph.
Maximum Speed Rating Maximum Tire Pressure and Maximum Load Rating. If the Y speed rating is indicated inside of parentheses this means that particular tire size and specification has been tested at speeds in excess of 186 mph. Exceeding the speed rating will cause the tire to heat up and fail easier.
53 rows For example if a tire has a load index of 92 it can support 1389 pounds at. Up to 43 mph. While there are numerous detail differences this laboratory test is similar in nature to those used to confirm a tires speed ratings.
Keep in mind that the tire load index is crucial when shopping for a replacement tire. This 65MPH test allows the tire to qualify as a high speed tire. Unless otherwise noted trailer tires are rated as 65 miles per hour as their max speed.
For more speed limits please refer to speed rating Chart below for more detail. To get a clearer understanding of tire speed rating heres a chart to help you. Every ST Trailer Tire you see on the highway goes through this exact same test regardless of tire size or manufacturer.
Uniform Tire Quality Grade UTQG Standards Tire Rack85 to 100 Every tire sold in the United States must be capable of earning a C rating which indicates the ability to withstand 85 mph speeds. Load rating and speed index should be looked at together when buying new tyres. A speed rating chart is used to indicate the standard maximum speed capacities for different types and sizes of tires under optimal operating conditions.
Example shown in diagram. A speed rating chart is used to indicate the standard maximum speed capacities for different types and sizes of tires under optimal operating conditions. A common car size 2155516 has a load capacity of 93 which reading of the chart equates to 650kg per wheel.
Never exceed the speed rating of the tow vehicle tires or the trailer tires. If Y speed rating is indicated without parentheses as normal this means the tire is rated up to 186 mph. Trailer Tire Speed Ratings Load Capacity 65mph.
Tire load rating chart. Speed ratings are designated using alphabetic symbols A to Z with the exclusion of I O and U. Speed Rating Max MPH Max KMH.
Tire Speed Rating Chart. Psi highway steer and all position tread designs used in normal highway service tire size max speed rating inflation pressure - psi mph 25 30 35 40 45 50 55 60 65 70 75 80 95 110 st20575r14 87 1170 1300 1430 1530 1640 1760 1850 1950 2040 d st21575r14 87 1270 1410. RV Tires Speed Rating.
Most passenger car tire load indexes. For tires with a maximum speed capability higher than 240 kmh 149 mph a ZR may appear in the size designation. N Up to 87 mph.
It is a two- or three-digit number that precedes the tyre speed letter at the very end of the code. The lowest rating L is 75 mph. Tire Speed Rating Chart.
Notice that Z comes right before W and Y. Tire Speed Rating chart. Remember that knowing the right trailer tire speed rating is.
We do have a couple brands that have higher speed ratings. W and Y-speed tires were innovated later as cars got faster with the help of technology. It has been proven under testing conditions that tire can operate for a certain period of time up to 75 mph.
For L is up to 75 mph. Spare Tire Load Inflation Chart. So please refer to your tires specifications.
A tire rated L for speed means it can be operated up to 75 mph. Special Trailer Tire Load Inflation Chart. A tire rated M for speed can be operated up to 81 mph.
Tire Speed Rating Chart. The rated loads of the tire. Tire load index chart.
A tire with a size of 27555R20113T has a speed rating of T. A trailer tire that does NOT indicate any specific speed rating on its sidewall should be presumed to be rated for 65 mph. 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.
Every letter is represented in a standard tire speed rating chart. A Y speed rating denotes maximum tire performance. Consult the tire manufacturer for maximum speed when there is no service description.
Please note that this is the speed rating chart example used for instructional purposes.
