Involving my question below...can somone break down the "225/45ZR17 90W" for me?
11-06-2001, 02:41 PM
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http://www.tirerack.com/tires/tiretech/general/size.htm
<a href="http://www.tirerack.com/tires/tiretech/general/size.htm">http://www.tirerack.com/tires/tiretech/general/size.htm</a>
11-06-2001, 02:55 PM
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Y and W are subsets of Z, they don't really exceed Z ratings.
Meaning, Y and W were devised with a need for a further level of granularity than Z rating provided (over 149 mph). Any tire that qualifies as Y or W is also, by default, a Z rated tire.
11-06-2001, 02:58 PM
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225mm section width, 45 aspect ratio (sidewall height is 45% of section width) Z is speed rating of
149+mph (formerly "unlimited")
R=radial tire (you'd be hard pressed to find a bias ply tire unless you're shopping for trucks or tractors)
17=wheel diameter
90=load factor (don't know exactly, but something close to 1900#)
W=further clarification of Z speed rating, W=168 mph, only Y is higher at 186 mph.
Hope this helps!
R=radial tire (you'd be hard pressed to find a bias ply tire unless you're shopping for trucks or tractors)
17=wheel diameter
90=load factor (don't know exactly, but something close to 1900#)
W=further clarification of Z speed rating, W=168 mph, only Y is higher at 186 mph.
Hope this helps!
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11-06-2001, 03:04 PM
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(Best Vader voice) "You are correct!" Early on, manufacturers went right to the end of the alphabet
for a speed rating of "unlimited" or 149+, but as cars got to be considerably faster, they had to back-paddle and invent new ratings for the higher speeds, thus W and Y.
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