245/45R18 vs 245/45zr18 

"itschrome" (itschrome) 03/29/2017 at 16:46 • Filed to: None

0

18

whats the difference in those tire sizes?

Stupid truck for your time.

Party-vi > itschrome 03/29/2017 at 16:48

10

One is German:

245/45 ze Rim 18

crowmolly > itschrome 03/29/2017 at 16:48

2

Nothing, just speed rating is included in the latter.

https://www.tirerack.com/tires/tiretech/techpage.jsp?techid=35

However, the actual tire measurements could be slightly different based on brand.

Sampsonite24-Earth's Least Likeliest Hero > itschrome 03/29/2017 at 16:48

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youre a stupid truck...

vicali > itschrome 03/29/2017 at 16:48

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about 300km/h..

If only EssExTee could be so grossly incandescent > itschrome 03/29/2017 at 16:49

1

The “Z” indicates that it is Zombie rated. The compound and tread are specially formulated for crushing the skulls of the undead. They are very popular with doomsday preppers.

dogisbadob > itschrome 03/29/2017 at 16:50

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nothing

bob and john > itschrome 03/29/2017 at 16:51

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speed rating.

Discerning > itschrome 03/29/2017 at 16:54

5

The letter (when between aspect ratio and rim size) denotes speed.

ZR = over 149 mph
R = 106 mph

https://www.tirerack.com/tires/tiretech/techpage.jsp?techid=35

e36Jeff now drives a ZHP > itschrome 03/29/2017 at 16:55

3

The Z is actually an outdated speed rating, it indicates the tire is approved for speeds above 149mph, however exactly how much more than 149 is undefined. It has been superseded by W, Y and Y in parentheses. W is up to 168mph, Y is up to 186mph and Y in parentheses is in excess of 186mph.

Manwich - now Keto-Friendly > itschrome 03/29/2017 at 16:59

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One is high performance because it has “ZR1" in the size...

HFV has no HFV. But somehow has 2 motorcycles > itschrome 03/29/2017 at 16:59

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Google tire diameter calculator

HFV has no HFV. But somehow has 2 motorcycles > HFV has no HFV. But somehow has 2 motorcycles 03/29/2017 at 16:59

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I just actually looked at the numbers... idk

itschrome > e36Jeff now drives a ZHP 03/29/2017 at 17:13

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well no becuase the tires I want are w rated.. so it’s not the rating... it’s in the size..

itschrome > Party-vi 03/29/2017 at 17:13

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haha

itschrome > Discerning 03/29/2017 at 17:15

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crazy I never seen the rating in the tire size like that before. so weird.

e36Jeff now drives a ZHP > itschrome 03/29/2017 at 17:25

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Its still part of the speed rating. Most tires that have a speed rating above Z still have the Z along with the W, Y, or (Y). The Z is redundant. the Tire Rack has a nice writeup about reading tire codes: https://www.tirerack.com/tires/tiretech/techpage.jsp?techid=35

You can see the Y coded tires at the bottom using both ZR and Y in the same tire code.

itschrome > e36Jeff now drives a ZHP 03/29/2017 at 17:28

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yeah I saw that in another post.. how weird man... why put it there to confuse us all. haha

e36Jeff now drives a ZHP > itschrome 03/29/2017 at 17:32

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Probably because ZR sounds cooler.