ray1202

Hi all.

I was reviewing my IS250 owner manual to see the tire sizes it rexommands. In the tire and wheel section. It said something like type A,B...E. What does these types mean?

Thanks

NVMarkus

iTrader: (2)

it is the wheel type, dependent upon the wheel package

ray1202

So if the manual said type B are 225/45R17 but my existing tires are type D 225/45R18, can I assume that the 225/45R17 tire will fit my car?

Many thanks

NVMarkus

iTrader: (2)

With the different rim size, and you will have to worry about the offsets of the wheels as well. B is a 17 inch rim and D is an 18... But yes if you are going to a 17 rim, and the offset is correct the tire would be a factory size tire

ray1202

Thanks for the quick reply. What is offset ? I searched on google, it said it the size of the rim, is that correct? I though only the 225/45R17 rim would fit the 225/45R17 tire isn't it?

corradoMR2

Offset is the distance (+ or - ) from the center line of the rim. This value determines how far "in" or "out" the rim is within the fender.

Tires and wheels can be a little tricky to understand if you are new to this. See the following to help:


http://www.goodyearautoservice.com/c...eName=TireSize

ray1202

Thank you so much for all the information. I am new to these, please bear with me and all the questions.

I was reading the user manual, it mentioned that the wheel size should be 17x71/2J. All i get from this is 17" wheel, not too sure what the other numbers are and Google aren't very helpful on this matter, but i don; think it is the offset number.

Can you please let me know what size of the wheel i should get for the 225/45R17 tires and what's the offset, or how can i get the information?

Thanks in advance

hoya08

17x71/2J is read 17 x 7.5 J. It means a 17" wheel with a 7.5" wheel width. The "J" represents the shape of the wheel where the tire bead seats.

On a 7.5" wheel, 225mm tire is fine. I wouldn't go larger than 235 though.

But most importantly, as others have mentioned, the offset has to be correct or the wheel will not fit; either too much poke or too close to the shocks/struts.

ray1202

Thanks. How can i get the offest information?

hoya08

The offset is stamped on the inside of the wheel, on or near the hub or the spoke. Look for the wheel size and then the number next to or under it. For example a 17x7.5J41 or 17x7.5JET41 wheel has a +41 offset.

From the OEM offset number, you can use the calculator below to determine the offset for new wheels. The calculator will show you how much "in" or "out" the new offset will cause.

http://www.1010tires.com/Tools/Wheel-Offset-Calculator

hoya08

Here's my old ride to help show what different offsets look like. The fronts' are 17x7.5J et41 and the rears' are 17x9J et8.

Generally speaking, the smaller the offset is, the more concave or deeper the wheel well.