I want to buy tires but don't know what all those numbers mean. This is what my tire says 205/55R16 91H What does this mean?
Drop the 91H from your reading. You have RADIAL tires (R) whose size is 205mm at the widest point, and whose heiight (measured from the ground to the rim) is 55% of the wiidth (called the aspect ratio) and the rim size is 16"
The 205 means the tire is 205 MM wide, the 55 means the tire from the rim to the ground is 55% of 205 or 112.75 MM tall, the R stands for radial, the 16 is the rim diamater, I don't know what the 91 is but the H is the tires speed rating, which means the tire is built to sustain 120 MPH for an extended period of time.
first number, 205, is the thread width in cm; 205 centimeters wide. 2nd number, 55, is the ratio of the sidewall to the width of the thread. The sidewall is 55% of the thread, or 112.75 cm "R" means its a radial tire "16" is the size of the rim "91" is the load index; how much weight the tire can carry, which is 1,356 pounds maximum load. "H" is the speed index; the tire is rated to travel no more than 130 mph Keep in mind that these specs are applicable only when the tire is in brand new condition. As the tire is used, it undergoes wear and tear, and the specs will go down as the tire ages.
