Specifications of the Falken Azenis RT-615

• A subsidiary of Sumitomo Rubber Industries, Falken first began manufacturing tires in Japan in 1983. Two years later, it entered the North American market. The focus of the Falken company is on UHP, or ultra high performance, products. The Falken Azenis RT-615K is one of Falken's most popular tires, and is used by Formula Drift teams.

Size

• The size of the Azenis RT-615K ranges from 195/60R14 to 315/30R18. The first number indicates how many millimeters the tire is from the widest point of its outer sidewall to the widest point of its inner sidewall; this measurement is also known as the tire's section width. The second number is a measure of the tire's sidewall height as a percentage of its section width. The R means that the tire has a radial construction, meaning that the tire's plies "radiate" from the center of the wheel. The final number shows the diameter of the wheel and the tire in inches.

UTQG and Load/Speed

• The Uniform Tire Quality Grade, or UTQG, for all the Azenis RT-615K tires is 200-A-A. This is a measure of the tread-wear grade and the traction grade. The 200 indicates that the tread of these tires will last twice as long as a standard test tire, while the AA indicates that these tires have the highest possible traction grade, having traction coefficients of 0.54 g force on asphalt and 0.41 g force on concrete.

  A tire's load and speed are coded with a number and a letter, respectively. The load and speed of the Azenis RT-615K tires ranges from "83W" to "103W," meaning the load ranges from 1,074 to 1,929 lb., and the maximum permissible speed was 168 mph. One tire is an 86H, meaning it can withstand 1,168 lb. and a maximum speed of 130 mph.

Rims and RPM

• The rims for these tires measure 6 to 11 inches. However, the tires are approved for rims ranging from 5.5 to 7 inches for the smallest tires, to 10.5 to 11.5 inches for the largest tires.

  The maximum rotations per minute for these tires ranges from 768 to 911.

Weight and Pressure

• The Falken Azenis RT-615K tires weigh 18 to 32 lb., and they have a pressure of 50 or 51 pounds per square inch.

Tread

• The width of these tires' treads, or the rubber around the tire that touches the road, ranges from 6.6 to 11.7 inches. All have a tread depth of 8/32 of an inch.