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What exactly does ZR on my tire stand for?

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Old 04-01-2009, 12:41 AM   #1
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Default What exactly does ZR on my tire stand for?

On the side of my tire it states 265 35 zr18 ihave always wondered what zr and xr stands for i know what it means but what does it stand for.
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Old 04-01-2009, 12:52 AM   #2
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S -- 180km/h or 112mph

T -- 190km/h or 118mph

U -- 200km/h or 125mph

H -- 210km/h or 130mph

V -- 240km/h or 149mph

W(ZR) -- 270km/h or 168mph

Y(ZR) -- 300km/h or 186mph

ZR -- Above 300km/h or 186mph
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Old 04-01-2009, 12:54 AM   #3
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Opps.... just re-rad your post.... don't guess that helped.
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Old 04-01-2009, 02:25 AM   #4
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Quote:
Originally Posted by wabmorgan View Post
Opps.... just re-rad your post.... don't guess that helped.
its ok man i was just curious what it actually stands for if it stands for anything at all but i am glad you no (or did ur research) what it means cuz i didnt no exactly the mph it can with-hold but all of it is interestin. if anyone posts a reply to my threads they are always helping me. thanks man. i am glad someone out there knows what it is.
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Old 04-01-2009, 05:17 AM   #5
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nothing, it is just a way of rating them
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Old 04-01-2009, 05:23 AM   #6
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It Means you can go Nice and Fast without worrying about a blowout. *Nails are exempt*
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Old 04-01-2009, 12:50 PM   #7
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Pretty sure its Z RATED. Thats where the Z R comes from. Maybe not - but it sounds good right?
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Old 04-01-2009, 12:52 PM   #8
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Just a rating, basically if you have a tire that is not designed for the speed your driving, then slow the heck down.
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Old 04-01-2009, 01:41 PM   #9
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Z is the speed rating. R stands for radial. Y and W rated tires will also have ZR in the numbers because Z was believed to be the highest possible speed rating. Then the W and Y's came out. So for whatever reason they leave the ZR in there.
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Old 04-01-2009, 03:36 PM   #10
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Quote:
Originally Posted by AR15 guy View Post
Z is the speed rating. R stands for radial.
He's got it.
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Old 04-01-2009, 05:23 PM   #11
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I should hope so. I sell tires for a living
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Old 07-26-2009, 05:09 PM   #12
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thanks
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Old 07-26-2009, 05:11 PM   #13
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don't think the cts-v has to have the zr i can drop down a rating
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Old 07-26-2009, 10:06 PM   #14
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Quote:
Originally Posted by mlr View Post
don't think the cts-v has to have the zr i can drop down a rating
im pretty sure they cane with Z rated tires from the factory. you can drop a speed rating to V. i would not recommend going any lower than that
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Old 07-27-2009, 01:44 AM   #15
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zealous ricer
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Old 07-27-2009, 10:32 AM   #16
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AR 15 has it correct. Z is the speed rating or and the R stands for radial. Most Y and W will say ZR as well, just like he said.
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Old 07-27-2009, 10:56 AM   #17
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When they created the original ratings Z was the highest and nobody thought that street cars would end up with tires that needed anything better. When the newer cars needed tires to handle speeds better than "149+" they broke the Z category down with W and Y. Street cars probably won't need street tires with ratings significantly above 186mph so perhaps this rating system will stay safe.
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Old 07-31-2009, 05:10 PM   #18
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its a secret
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