What is the right offset for a 8.5" wide wheel?

[Mdriver13]

Hi Guys,

Trying to decide whether an (offset) et38 would be better than et42 with a 18x8.5 wheel. These are my two offset confused choices for the wheels I like, but I don't want them to rub on the strut and I would prefer not to use a spacer. Tire size will be 245x35x18. I run OEM springs with Koni SA's up front. I have rolled fenders in the back, so either offset should me a non-issue in the rear.

TIA,

Mdriver13

[guinness325i]

If in doubt go with the higher offset (42) since you can always add spacers to lower the offset if needed but you can't add anything that will increase the offset.:eyecrazy
I run M5 replicas and they are 8.5x18 ET35 with 235/40/18 BFG g-Force Sports and I wish I had a little more offset because I'm right at the inner fender lip up front.

[Mdriver13]

good point...

[mikeo]

My 18x8.5 BBS RCs are et38 offset. I currently run 235x40 tires all around with no front issues at all and it looks like 245x35 would be no problem either. If you go with the et42 offset I would think you can count on having to use spacers--which IMO is not an ideal solution.

[LuvMy328is]

I am running 18x8.5 wheels w/ 40 mm offset. 245/35/18 tyres, minor rubbing on RR w/ full tank of gas and Passanger. Have your wheels aligned and balanced and toe all set to that of an M. I have a H/R sport spring/Bil. sport shock setup with 1.2 drop front 1" rear. The "M setup" on alignment and other settings greatly reduced my problems.
~Phillip