Speed rating index As with the load index, this letter references a look-up table which indicates the maximum permissible speed of a tyre. In this example, “H” means the vehicle has a maximum speed of 130mph under the maximum load.
What does h mean on a car tire?
H – the speed index, this means the maximum permitted speed, here 210 km/h (130 mph) Prior to 1964, tires were all made to a 90% aspect ratio. Tire size was specified as the tire width in inches and the diameter in inches – for example, 6.50-15. From 1965 to the early 1970s, tires were made to an 80% aspect ratio.
What is the difference between height and diameter of a tire?
The height is measured in a height-to-width ratio. The diameter is measured in inches and tells you the size of the rim or wheel that the tire will fit onto. For example, a tire with a width of 225, a height of 50, and a diameter of 17 would be considered a 225/50/17 tire.
What is a tyre size calculator?
There are many more possibilities and choices in metric tyres so the use of a tyre size calculator can come in handy. The tire size comparison calculator takes the measurements of two tyres and compares the diameter, width, sidewall, circumference, and revolutions per mile.
What do the three numbers on a tire mean?
The three numbers on tire size represent the width, height, and diameter of the tire, respectively. The width is measured in millimeters and indicates how wide the tire is from side to side. The height is measured in a height-to-width ratio. The diameter is measured in inches and tells you the size of the rim or wheel that the tire will fit onto.
What is G or H rated tires?
Most tires for trucks today are rated G or H. “Based on the size, most G-rated tires can hold approximately 6,000 pounds, while an H-rated in the same size can hold roughly 6,500 pounds at the same pressure per tire,” said Rob Williams, senior director of TBR sales at Hankook Tire.
What is a h speed rated tire?
H speed ratings are common in the grand touring all-season tire category. A W means the tire is approved for speeds up to 168 mph (270 km/h) under optimal conditions. W speed rated tires land firmly at the performance end of the speed rating spectrum. Ws are suitable for performance coupes and sedans, and even street driven exotic sports cars.
How do you know if a tire is H rated?
The rating is the speed the tire has been tested to for continuous safe driving. The English equivalent speed for H-rated tires is 130 mph and V-rated tires are good for up to 149 mph. There are two ways the speed rating will be indicated on the tire sidewall. The older method puts the speed rating next to the “R” for radial in the size.
What are G rated tires?
Typically, G-rated tires refers to the stronger tires commonly used for trailers and RVs. The exact amount of weight these tires can hold varies. However, it is usually around 4,000 pounds each. However, G-rated tires can also refer to the speed rating of the tire. These tires can go up to 56 mph, which typically isn’t enough for most drivers.
What does a T rating mean on a tire?
A T rating indicates the tire is approved for speeds up to 118 mph (190 km/h) under optimal conditions. T ratings are most associated with standard touring tires, and everyday passenger vehicles like family sedans and minivans. An H speed rating indicates the tire is approved for speeds up to 130 mph (210 km/h) under optimal conditions.
