Weekend dumb question...

[panic]

What's exactly the ET number in a wheel? Is it the same of what the americans call ''backspace''?

A wheel with an ET of let's say 40 compared to a smaller number (ET30/35...)is more inside or more outside the side of the car?

[clive f]

have a look here, this should help.

http://www.gomog.com/allmorgan/wheeloffset.html

the griff wheels are a positive off set, so an et of less than say 40 will put the wheel closer in to the hub.
I think the standard wheels on the front are et25, and 40 rear.

Edited by clive f on Saturday 1st November 08:50

[dnb]

It's ET35 rear. But some people claim 37.5

Remember that it's measured from the centreline of the wheel, so if you change the width of the wheel, chances are you need a different offset.

[panic]

...So a 40 ET will pull the wheel more to the side fender and a smaller (30 or 35) will push it ''in''...?

I need to know because i'm waiting my new wheels with 25 ET front (stock) and 40 ET (instead then stock 35) rear...and need to see if a 255/35/18 tire will stay within the wheel well without rubbing the fender, or should i go for a narrower (245...) tire to avoid problems.

[dnb]

The bigget the (positive) offset, the further away from the fender.

Eg: if you have a (standard) 7.5 inch wide rim, you need an offset of ET35. To keep the rim edge the same distance from the fender you need an offset of approx ET42 for an 8 inch wide rim.

[panic]

dnb said:

The bigget the (positive) offset, the further away from the fender.

Eg: if you have a (standard) 7.5 inch wide rim, you need an offset of ET35. To keep the rim edge the same distance from the fender you need an offset of approx ET42 for an 8 inch wide rim.

Thanks, I've it clear now, the bigger the ET the more the wheel will get 'in' putting more distance from the fender...

Have all a sweet weekend.