v_skogh

Hi.
I have search for ET info without findning anything.
To my question, today I will order new rims for my car. BBS CH 8,5x18" but i do not know witch ET i shall have.
Front 42
Rear 38
Is that OK?
I want it a little wider rear, is it OK to go so?

Kind regards

93redFD

et?? On a 18's??? you leave those et's for stock rims.
et streets or drag slicks??
They dont even make a et streets for 18's, not even sure they make them for a 17(not sure about 17, just a guess) I know theres a drag radial for the 17. Even if they do make a et for the 18's, do you know how much money you will spend on tires in a year. alot. et's arent cheap. Dont know how long they last but not very long. I think all the streets are is a drag slick with a grove in it to bearly meat the standards for leagel street use.

93redFD

now I might be wrong, so please dont falme me if I am

93redFD

I think this also should have been in the wheel and tire section

black99

no by ET I think he means backspacing... (It's quite confusing though)

v_skogh

OK, you think about the tire ET.
When we talk about ET in sweden we talk about how near to the wheelhouse the complet wheel will come. And this will depend on which ET on the rims you use.
Do you understand what I mean?
42 mm or 38 mm in this case.

black99

If all you got for choices is 38mm or 42 mm I would use 42mm for both front and back. I'd go with 18x8.5 front and 18x9.5 rear. You should be ok for both with a 42mm for both. This is just my thinking though. But you might want to check with the guys in the wheel/suspension part of this forum to be sure.

v_skogh

Offset i mean. Offset = ET i sweden
Is it possible to drive on different offset rear and front.
I want this wider look in the rear but i need 8,5" rims all around bacause of my tires.

rynberg

screw your tires

get 18x9, as close to +45 mm offset as possible, run 245/35 or 255/35 tires

if you want it wider in the back, you can do 18x10 +50mm offset with 285/30s. This will require aftermarket 2.5" diameter coil-overs.

dclin

iTrader: (4)

18X10 +50 in the rear will work fine w/o smaller diameter coilovers.

v_skogh: All the offsets mentioned with their respective sizes will work fine, including yours. I know what you mean about wanting an offset in the rear to push it out a little bit (assuming you want to keep the same width front and rear), but as others point out - you might as well go wider in the rear as that you lost your ability to rotate wheels if they are of different offsets.

Having the same wheel width and tire size, irregardless of offset, means more balanced handling of course. You'll have decide what's more important for you.

Do a search for 'offset' in the Wheels/Suspension section and you'll have enough reading to last you a week.

rynberg

My bad, I thought you needed the smaller diameter springs to avoid hitting the suspension with 10" wide wheels. dclin, when running a 10" wide wheel, do you need aftermarket trailing arms?

dclin

iTrader: (4)

You're thinking of the front hehe. The front may require you to have smaller diameter springs to allow clearance. I say *may*, because of below.

I had 18X10 +44 (on the rear) at one time, with stock suspension pieces. About 10mm space between the tire sidewall (285/30/18) and the trailing arm. These where Gewalt Evolutions. All things being equal, a 18X10+50 in the rear should fit fine (and better IMO, as that 18X10 +44 was RIGHT flush with the fender lip, and would have required minor lip rolling or trimming if lowered significantly.

SleepR1 pointed out in the Wheel forum that an 18X10 does not actually measure 10" wide, lip edge to lip edge. When one says a 10" wide wheel, this is the measurement of the inner portion where the bead of the tire seats. See pic, indicating wheel width:

http://www.tirerack.com/wheels/tech/offset.htm

This is standard, so a 18X10 for Brand A will measure the same as Brand B is this regard. However, the distance from lip edge to lip edge can vary from manufacturer to manfacturer. When one is right at the limit (in this case, 18X10), the difference in lip edge can mean the difference between hitting the trailing arm, or not.

So far, it appears that everyone that has put 18X10s up front are using CCW wheels, and it appears CCW wheels have a very wide lip edge to lip edge measurement. I remember when I put my 18X10 +44 on front, just for grins, there was almost two finger width space between the wheel/tire and the stock diameter spring - maybe 20mm or so. This leads me to believe it might be possible to fit a 18X10 +50ish up front with my particular brand wheel/tire, even with stock dia springs. Gewalt does not anything larger numerically then +44 in 18X10 though.

Sleep might be on to something...but we will not know for sure until somebody tries putting a 18X10 from another manufacturer on the front.

dclin

iTrader: (4)

Here is a pic when I stuck 18X10 +44 285/30/18s Gewalt Evolutions on the front, for fun (I was bored):



A 18X10 +51 would push it back into the wheel well 7mm, all else being equal. Anyways, 18X10 up front is right at the limit, so little things like total wheel width (li edge to lip edge) may factor into fit.

rynberg

thanks for the info dclin, I must have been thinking of the fronts. Are you lowered at all running those wheels?

dclin

iTrader: (4)

With the Gewalt Evolutions, my combo was 18X8.5 225/40/18s (temporary tire, because 245/35/18s were backordered at the time) Pirelli P Zero Assimetricals front, and 18X10 +44 285/30/18s rear.

Car was lowered about .75". Note that the pic above was just a little experiment. I actually drove around the neighborhood with the 18X10s up front, though it would have obviously contacted the fender lip had I hit a bump hard enough or cornered hard. Besides that obvious, some minor rubbing of the inner liner directly in front of the tire, at full turn/wheel lock (if you sit back and think about it, they ARE 18X10s 285/30s hehe).

If I was to go with 18X10s up front, it would just have been a very minor thing, and certainly something I could live with. Again, something like 18X10 +51ish would fit upfront, though whether or not you really need to use skinny coilovers (depending on wheel manufacturer) remains to 100% confirmed.

93redFD

opps!! sorry about that, Im sorry. I thought that he was talking about mickey tompson et's