Help calculating offset for FD
 

I've read a lot on offset for wider wheels, but I wonder about the basic question: what is the goal when selecting an offset?

Is it:
A) trying to keep the inside edge of the wheel in the same location? (for clearance?)
B) trying to keep the outside edge of the wheel lined up with the fender? (for appearance?)
c) a mixture of both?

Perhaps the question can be restated as: for a wider wheel, where is the extra width supposed to go (inside and outside), and how much extra room is there compared to stock?

I'm looking in the ballpark of 17x8 or 8.5 in front, 17x? in back, FWIW.

Dave

8 x 17 front offset ranges from 38 to 50 mm

8.5 x 17 front offset ranges from 40 to 50 mm

9 x 17 rear offset ranges from 38 to 50 mm

9.5 x 17 rear offset ranges from 42 to 50 mm

The larger the offset the further inboard the wheel/tires go...the smaller the offset the futher outboard the wheel/tires go...

It's up to you in choosing the offset that works for your application.

With a 18x9 18x10 I run a 45 offset on both, with 255/35/18 tires in front and 285/30/18 tires in rear. Although I havent put them on yet I am still waiting for the stupid rims to come in from Japan. But I was told this will work from many people. It seems like most people agree that close to 50 will work, correct me if I'm wrong.

The rears might rub slightly with 285/30-18s, but you can roll fender lips...

Also depends on how much the car is lowered. Mine with 18X10+44 285/30/18 P Zero Assims did not rub at stock or with slight lowering (.75" or so). Any lower though, and it would. I believe this has to do with the wheel tilting top inwards when the suspension compresses - thus clearing the lip.