The 'Q' rating on the tyre represents the speed rating and any tyres that come with a 'Q' speed rating means that the manufacturer recommends a maximum speed of 99mph.
Speed Rating
The highest obtainable DOT rating for automotive tires is AA for Traction and A for Temperature. This rating is obtained by a variety of tires from various manufacturers.
The H is the speed rating. The H rating means the tire has a speed rating of up to 130 mph. http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=35
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.
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
Howard Stern on Demand - 2005 Q Rating was released on: USA: March 2008
The 99 is the load rating and the H is the speed rating. The higher the load number the more weight the tire can carry. The speed number H means it is rated to 130 mph.
It depends on your tires. Look for the "PSI" rating on the wall of the tires.
a fartingship
The max load rating for BF goodrich Long trail tires is unlimited. It fits all car and it doesn't have a maximum load rating. This is a good tire brand.
A speed rating of H indicates that a tire is rated for a maximum speed of 130 mph (210 km/h). This rating is part of a standardized system used to signify the tire's capability to safely perform at certain speeds. Tires with an H rating are typically suitable for performance vehicles and some sedans that require higher speed handling. Always ensure that tires match the vehicle manufacturer's specifications for safety and performance.
Tires are specified by the manufacturer with a maximum load rating. Tires are also specified by the vehicle manufacturer with a recommended inflation pressure.