hey guys, this is a question ive been pondering for quite some time.

what relationship, if any, does wheel width have in relation to offset?

for example. on a hypothetical fender...would a 17x7 wheel with a +10 offset sit the same as a 17x8 wheel with a +10 offset?

im thinking no. im trying to test fit some spacers on my stock 16x6 wheel to judge the best offset and stance...but the wheels i plan to buy are 17x7. you can see my dilemma.

any tips to help me calculate?

thanks in advance fellas.

 

i can't answer your question but i literally just ordered some 17x7's today with a +38 offset, i'll let you know how it goes

 

Awesome! You rock man. Some closeups of the front and rear fenders from diff angles would be very very helpful. What tire size/profile and wheels did you decide on? Are you lowered?

 

im probably gonna go with 205/40/17, not lowered yet but planning on the tein s-tech's

 

Ok here are a few things about offsets and rims







To summarize the above pictures into words... A wheel consists of the Rim and the Mounting Plate. When a wheel has 0 offset the mounting plate is in the middle of the rim. If you have positive offset it moves the rim out towards the body, if you have negative offset it moves the rim in towards the middle of the car.

The larger the + offset the more the wheel will be towards the middle of the car

The smaller the + offset the more the wheel will be pushed out towards the fender

The smaller the - offset the more the wheel will be towards the middle of the car

The larger the - offset the more the wheel will be pushed out towards the fender



Now a 17 x 7 rim will have 3.5 inches on each side of the centerline, a 17 x 8 will have 4 inches on each side of the centerline. So increasing an inch in rim size will extend the rim towards the fender only 1/2 inch

 

Got it! Im no math major, but let me know if this is correct.

So on this hypothetical fender, with no strut clearance issues...my 16x6 wheel has an ideal offset of lets say, +30.

If i upped the width by 1 inch (roughly 25 mm). This would push my wheel out 1/2 inch (roughly 12.5mm)

So subtract (add + offset) 12.5mm from +30 and you get around a +42 offset.

So a 16x6 wheel with +30 offset would sit roughly the same as a 17x7 with a +42 offset?

I hope i didnt just make a fool out of myself please excuse all the runon sentences as well.

 

So a 6 inch wide rim will extend 3 inches from the center with a +30 offset means that outter most edge would be 3inches - the 30mm offset (larger offset pulls the tire towards the center)

If you up the width by an inch then you have a 3.5 inches from center

So lets say for argument sake 1 in is 25mm

6 inch rim would be 75MM from the centerline - 30mm from the offset so you would be 45MM to the outter most edge

7 inch rim would be 87.5mm from the center which would be a 42.5mm offset to have the same outter most edge

 

Man I'm interested in this as well but it looks harder than it probably is to understand ...

 

im not even gonna try to understand it, im gonna put on some tires and see if they fit

 

^ lol @ you guys... its not rocket science (haha i finally got to use that)

 

Yeah I know but like I said I'm sure it looks harder than it is to calculate