If I got a 16 x 7 rim w/ 205/50 R-16 tires, how do you determine what offsets will work? I wouldn't want any rubbing, but it would be nice if the wheels didn't look too far inside the wheel wells.

Would 16x7 w/ 37 mm offset work, or would that rub?

Thanks,

 

an easier way of determining what you need would to revert to backspacking rather than offest. Use your stock wheels or your current wheels and start measuring. All you need is a straight edge and a small square.

I know the wheel companies that I've been calling (I-forged, billet specialties) have been less than helpful in offset questions. Both of them would rather deal in backspacing measurements.

 

I-Forged and Billet Specialties probably weren't helpful because offset is a measuring standard typically used for cheap cast wheels. Higher quality, custom built forged and billet wheels have always used the more appropriate back spacing standard. If you are getting into wheels, especially quality wheels it is probably a good idea to learn how to make the conversion between the two.

First to go from offset to backspacing...

Lets assume you know you want a wheel that is 17x7 with a +38 offset. To make the conversion this is what you would do. Convert mm to inches: 38/25.4=1.496"

So the wheels are 17x7 with approximately 1.5" of positive offset. Now let's convert that to backspacing. You must understand that the actual width of a wheel is 1" more than the described width. So a 17x7 actually measures 8" wide outside to outside. So to get the backspacing you need the center point. 8"/2=4". So you have 4" to the center of the wheel, plus an additional 1.5" off offset. That means you will need 5.5" of backspacing on a 7" wheel.

To take it the other way...

18x8 w/ 6.125" backspacing...
8+1=9 (Actual wheel width.)
9/2=4.5" (Center of wheel. Half of width.)
6.125"-4.5"=1.625" (Backspacing less half wheel width. Offset)
1.625x25.4=41.275 mm offset (Convert imperial units to metric.)


By the way singleshot. I know for a fact I forged is familiar with xB fitment. And if you need to talk to someone, I can put you in contact with my buddy at Intro. They actual build all of the wheels for I Forged.

 

+25 or +35 and youll be fine and pretty flush

 

With 7 inch wheels, stick with an offset of around +40-42mm. Stock with a 6inch wheel +38mm