Tyres 'ZR' what does it mean please?

[agric]

Just coming to renew some front tyres but not certain what designation ZR means

[jjones]

http://en.wikipedia.org/wiki/Tire_code

[kambites]

http://www.nice-wheels.co.uk/tyrespeed.html

[//dean]

It's the speed rating of the tyre:

http://www.blackcircles.com/general/speedrating

[JR]

ZR is the category of speed rating and none of the sites above are quite correct.

VR is for speeds up to 150mph and ZR when introduced was for speeds over 150mph. As car speeds got higher the manufacturers subdivided ZR into three groups: Y, W and the original Z. Read the manufacturer's handbook carefully to determine the recommended speed and load rating. Jonathan

[agric]

hmm, my replies seem to be going amiss on the site this evening

Thanks for links and the info
I have ZR at the moment but was looking at W which are supposedly rated at 168MPH
which is more than my car achieve

is ZR a more comfortable (speed) safety margin?

[kambites]

agric said:

hmm, my replies seem to be going amiss on the site this evening

Thanks for links and the info
I have ZR at the moment but was looking at W which are supposedly rated at 168MPH
which is more than my car achieve

is ZR a more comfortable (speed) safety margin?

ZR is over 149mph.

[JR]

kambites said:

ZR is over 149mph.

I hate that. ZR is 150mph and over. VR covers 149.9 recurring.

[JR]

agric said:

hmm, my replies seem to be going amiss on the site this evening

Thanks for links and the info
I have ZR at the moment but was looking at W which are supposedly rated at 168MPH
which is more than my car achieve

is ZR a more comfortable (speed) safety margin?

At this point would you like to reveal the car in question? Esp were was the car manufactured in the ZR alone era or the w,y and z era?

[kambites]

JR said:

kambites said:

ZR is over 149mph.

I hate that. ZR is 150mph and over. VR covers 149.9 recurring.

No it isn't. ZR is over 240kph which is about 149mph.

Edited: Because I can't type.

Edited by kambites on Monday 14th December 20:45

[kma]

kambites said:

JR said:

kambites said:

ZR is over 149mph.

I hate that. ZR is 150mph and over. VR covers 149.9 recurring.

No it isn't. ZR is up to 240kph which is about 149mph.

you said it was over and now it's under? make your mind up.


theres probably a fair bit leeway with these ratings i'd imagine, i doubt another 10mph over the rating would make any difference.

[kambites]

kma said:

kambites said:

JR said:

kambites said:

ZR is over 149mph.

I hate that. ZR is 150mph and over. VR covers 149.9 recurring.

No it isn't. ZR is up to 240kph which is about 149mph.

you said it was over and now it's under? make your mind up.


theres probably a fair bit leeway with these ratings i'd imagine, i doubt another 10mph over the rating would make any difference.

Sorry. I meant over 240kph.

Either way it's not anything to do with 150mph except for coincidentally being close.

I dare say the tyres are safe up to a significantly higher speed but I suspect driving on too low a speed rating would invalidate your insurance.

Edited by kambites on Monday 14th December 20:44

[JR]

kma said:

kambites said:

JR said:

kambites said:

ZR is over 149mph.

I hate that. ZR is 150mph and over. VR covers 149.9 recurring.

No it isn't. ZR is up to 240kph which is about 149mph.

you said it was over and now it's under? make your mind up.

Lol, he's also at odds with the website that he quoted.