Wheel technical terms...

VanDerGraaf · Post by **VanDerGraaf** » Wed Feb 16, 2005 2:01 pm

Sorry everyone, just wondered if someone can explain exactly about wheel fitment info in general.
I.e, what is ET, pcd? And what does the J in wheel sizes refer to?
Tyres and stud number i'm ok with.

Could be useful for someone else too....

Rohan

edited by Volvo-bigbrother: moved to Springs and Wheels (70)

Murf · Post by **Murf** » Wed Feb 16, 2005 2:07 pm

PCD is pitch circle diameter, the diameter of the circle that the stud holes make, when taken right through the centre of each of the holes
j is the width of the alloy rim in inches and ET is the offset.

VanDerGraaf · Post by **VanDerGraaf** » Wed Feb 16, 2005 2:12 pm

Sorted!

atex61 · Post by **atex61** » Wed Feb 16, 2005 5:48 pm

Content removed.

Murf · Post by **Murf** » Wed Feb 16, 2005 5:53 pm

yes, there are still speed ratings and i think technicallythe police can give you a ticket or something if youve got a ferrari with tyres rated to 99 MPH on it, i could be wrong though!!

Take 195/50/15 for example. 195 is the tyres width, 50 is the depth of the tyre wall and 15 is the radius of the wheel in inches

Website · Post by **coyote1980** » Wed Feb 16, 2005 7:25 pm

It's all in dutch, but maybe this is of some help:

http://ssl.delti.com/autobanden/Reifenbezeichnung.html

With some googling you're probably able to find an english version as well. If there is enoug hinterest we could add a translated version to the FAQ.

VanDerGraaf · Post by **VanDerGraaf** » Wed Feb 16, 2005 8:08 pm

Murf wrote:yes, there are still speed ratings and i think technically the police can give you a ticket or something if youve got a ferrari with tyres rated to 99 MPH on it, i could be wrong though!!

Not sure about the cops, but i think for insurance purposes you must have the correct speed rated tyres for your vehicle.
This only applies in the sense that Murf wrote, ie a Ferrari with low speed-rated tyres would not be considered properly equipped.
But if you choose to put V rated (high speed) tyres on a slug of a car it would be ok.

Anyone else know any more about this?

Thanks for the link Coyote!

Cobold · Post by **Cobold** » Thu Feb 17, 2005 9:28 am

Hi ..

I found this on our page : http://www.sicherbestellen.de/mytires/Identifying.htm

greets

VanDerGraaf · Post by **VanDerGraaf** » Thu Feb 17, 2005 10:19 am

Good stuff; pretty comprehensive.