Speed ratings for tires indicate the maximum speed a tire can safely maintain over time. Expressed as a letter, such as "H" or "V," each rating corresponds to a specific speed limit, with higher letters representing higher speeds. For example, a tire with a "H" rating is rated for speeds up to 130 mph, while a "V" rating is for up to 149 mph. Choosing a tire with the appropriate speed rating is crucial for safety and performance.
According to the world wide web light truck tires are not required by the Department of Transportation to have speed ratings. From this, I gather that there are not speed ratings yet but probably will be in the future.
The speed ratings describe the durability of the tire at high speed, higher rated tires are of more sound construction.
You can find your tires' speed rating and load index listed on the sides of the tires. From there, you can use this guide to understand what those numbers mean: http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=35
When your tires squeal at a low speed it can mean a number of things. The tread on your tires may be almost gone or you may have low tire pressure.
Speed Rating
Yes. The speed rating simply means that the tires has been tested and is safe at certain speeds. As long as you do not plan on turning it into a race car that is fine. For more information on what the tire sizes and speed ratings mean see this article. http://www.associatedcontent.com/article/513017/understanding_tire_sizes_for_your_vehicle.html?cat=27
It indicates the maximum speed at which the tire can carry a load corresponding to it's load index.
T-Speed rated refers to a tire's speed rating, indicating the maximum speed a tire can safely sustain over time. Specifically, a T rating means the tire is approved for speeds up to 118 mph (190 km/h). This rating helps consumers select tires that are suitable for their driving habits and vehicle requirements, ensuring safety and performance. Always consult the vehicle's manual for the recommended speed ratings for tires.
The "104H" on tires indicates the tire's load index and speed rating. The "104" signifies that the tire can support a maximum load of 1,000 kg (2,204 lbs) per tire. The "H" denotes a speed rating, indicating that the tire is rated for speeds up to 210 km/h (130 mph). Together, these ratings help ensure that the tire is suitable for both load capacity and speed performance.
"Let me explain the speed ratings, though. Remember HR, SR, TR, VR, and ZR? Respectively, the tire is good up to 110, 115, 125, 149, and 150+ for long sustained speeds. If there is just an "R" then 105 is the sustained limit for safety at that speed. The higher speed rating will also bring increased ride harshness, as the tires have to be built to withstand the speeds for which they are capable." - http://www.midsouthvw.com/TechTips/tech_tip_tires.htm
the tires themselves.
104 T is the 'Load Index' and 'Speed Rating' on modern tires. The load # 104 means each tire can support 900 Kg and the speed rating 'T' means they are good to use up to 118 mph.