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
It depends on your tires. Look for the "PSI" rating on the wall of the tires.
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.
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.
Tires are specified by the manufacturer with a maximum load rating. Tires are also specified by the vehicle manufacturer with a recommended inflation pressure.
The speed rating is on the tire sidewall where you'll also find the P215 55R17 numbers/letters. The rating is in the form of a letter as follows: M= 81 mph N= 87 mph (usually used for temporary spares) P= 93 mph Q= 99 mph (usually studdable winter tires) R= 106 mph (mostly truck tires) S= 112 mph (family sedan tires) T= 118 mph (family sedan) U= 124 mph H= 130 mph (probably your Solara tires also used for many sport coupes) V= 149 mph (performance cars) W=168 mph (now the tires are getting really expensive) Y= 186 mph (super exotics) The letter will follow the 55R17 on your tires Cheers