dmyrick

i know the little 9*y stands for the tire load and max speed.

GBlansten

http://www.tirerack.com/tires/tirete....jsp?techid=35

sflgator

Z speed rated tire which is been tested to 186mph, I believe.

dmyrick

already checked there and could only find the 9*y

-michael-

http://www.tirerack.com/tires/tirete...jsp?techid=35&
http://en.wikipedia.org/wiki/Tire_code

dmyrick

When Z-speed rated tires were first introduced, they were thought to reflect the highest tire speed rating that would ever be required, in excess of 240 km/h or 149 mph. While Z-speed rated tires are capable of speeds in excess of 149 mph, how far above 149 mph was not identified. That ultimately caused the automotive industry to add W- and Y-speed ratings to identify the tires that meet the needs of new vehicles that have extremely high top-speed capabilities.

W 168 mph 270 km/h Exotic Sports Cars
Y 186 mph 300 km/h Exotic Sports Cars

While a Z-speed rating still often appears in the tire size designation of these tires, such as 225/50ZR16 91W, the Z in the size signifies a maximum speed capability in excess of 149 mph, 240 km/h; the W in the service description indicates the tire's 168 mph, 270 km/h maximum speed.

225/50ZR16 in excess of 149 mph, 240 km/h
205/45ZR17 88W 168 mph, 270 km/h
285/35ZR19 99Y 186 mph, 300 km/h

got it now days it essentially means 149, or nothing with the load and speed rating together.

jturkel

Zr.........zirconium....40th element on the periodic table of elements lol...

dmyrick

That is funny