View Full Version : this may be a stupid question..

01-26-2011, 11:02 AM
this may be a really stupid question, but i always see specs for tires and rims posted, i.e. what everybody is riding on, but have never really understood.. how are you supposed to read the specs? to me its all just a bunch of numbers. haha i know one is the width and one is the wall height but i dont know which is which and what anything else means.

could someone explain it to me please? [confused]

01-26-2011, 11:04 AM
play around with websites like


and you'll get it; thats how i understood them.

01-26-2011, 11:06 AM
alright ill look into it. i have tried searching it on here and google but nothing helpful really comes up. just what people are running and people asking what will fit.

haha but thanks ill be sure to check it out.

01-26-2011, 11:17 AM

01-26-2011, 11:19 AM


YY=Profile(how tall the tire is)

ZZ=Rim Size

For rims it is usually (X)x(Y) ET Z (5x112 is usually included on most audi rims since that is the bolt pattern most audis use(except the TT) and the 5 refers to the number of bolts and the 112 refers to the spacing to the middle of the hub)

X is how big the diameter of the rim is in inches

Y is how wide the rim is and is in inches

ET is the offset of the wheel, in other words the position of the middle of the rim that mounts to the hub. This is going to affect how far out the rim is going to be from the hub and will determine if you are going to have "poke" The closer the ET is to 0 the further out the rim is going to stick from the car. The higher the ET the closer it will sit to the hub. Stock ET is 45.

Spacers will basically lower your ET.

That's about as much as I know. Hope it helps!

01-26-2011, 11:31 AM
like lets say a tire is a 245/35z18. the 245 means the width of the tire in millimeter, the 35 stand for the hieght of the sidewall of the tire as a % so the sidewall would be 35% of the width of the tire (so it would be 85.75 millimeters if you do the math) the Z stand for the speed rating Z is one of the highest i think its rated for 150+ mph. and the 18 would be the rim size in inchs. hopefully that helps.

01-26-2011, 11:33 AM
sweet thanks guys. that helped a lot. i just never had any reason to learn it and now i just want to understand what people are talking about and all. especially because im (hoping) to get a b5 before the summer so it will come in handy then.

Thanks again! [up]

01-26-2011, 11:34 AM
one of my mates just launched a i-phone app for wheel fitment.



01-26-2011, 12:38 PM
thats pretty cool. unfortunately, im one of those unprivileged kids who doesnt have a smart phone.

01-26-2011, 12:47 PM
buy a iphone you pov **** :p