GrandPaJohn

The W has a 400 tread wear, the Z is 220. Which one was tested anyway? The TR review says 225/45/R17. Was that the W or the Z? Eddie?<ul><li><a href="http://www.tirerack.com/a.jsp?a=AR4&url=%2Ftires%2FSpec.jsp%3Fmake%3DPirel li%26amp%3Bmodel%3DPZero%2BNero">TR specs</a></li></ul>

Eddie@Tirerack

Nothing. From our site:

Today, the Z-speed rating is the only speed rating that is still branded "within" the tire size, as in P225/50ZR16. All other speed ratings are shown in the tire's service description.

When Z-speed rated tires were first introduced, they were thought to reflect the highest speed rating that would ever be required. Since that time the automotive industry has found it necessary to add W- and Y-speed ratings (indicated in the tire's service description) to identify the tires that meet the needs of new vehicles that have extremely high, top speed capabilities.


Miles/Hour Kilometers/Hour
P225/50ZR16 149+ 240+
P225/50ZR16 91W 168 270
P225/50ZR16 91Y 186 300


While all Z-speed rated tires are capable of speeds of 149 mph and above, prior to the W- and Y-speed ratings were identified in the service, how far above 149 mph was not identified.<ul><li><a href="http://www.tirerack.com/a.jsp?a=AR4&url=%2Ftires%2Ftiretech%2Fgeneral%2Fsp eed.htm">Tech Center</a></li></ul>

GrandPaJohn

in treadwear 400/220 and only in that size?

JimS_2kS4

while the 220 rated tire is the summer version (similar to the 225/40/18-sized Nero that is listed).

Jim