offsets

[Ericdd]

first off I wanna say great site, I love all the crazy setups, and I hope to have pictures of mine soon.

but I was looking around and I didn't see anything about offsets. The most important part about wheel fitment is getting the right offsets, and it would be nice to see something that explained offsets and measuring for proper fitment. incase someone wanted to order a custom setp or something. I know I'd love to learn about it :D

[M.Burroughs]

I shall write up an explanation.

[Ericdd]

great I can't wait :)

[87e30]

Woo! Good request!

[schroedin]

+1 it will be mucho helpful....o.

[doug118]

Wikipedia has a really good explanation of offset, its the most understanding from all of the other ones I've seen

The offset of a vehicle's wheel is the distance between the centerline of the wheel and the plane of the hub-mounting surface of the wheel. It can thus be either positive or negative, and is typically measured in millimeters. Offset has a significant effect on many elements of a vehicle's suspension, including suspension geometry, clearance between the tire and suspension elements, the scrub radius of the steering system, and visually, the width of the wheel faces relative to the car's bodywork.

Zero Offset - The plane of the hub mounting surface is even with the centerline of the wheel.
Positive Offset - The plane of the hub mounting surface is shifted from the centerline toward the front or outside of the wheel. Positive offset wheels are generally found on front wheel drive cars and newer rear drive cars.
Negative Offset - The plane of the hub mounting surface is toward the back or brake side of the wheel's centerline.


"Deep dish" wheels typically have negative offset or a very low positive offset.


To maintain handling characteristics and avoid undue loads on bushings and ball joints, the car manufacturer's original offset should be maintained when choosing new wheels unless there are overriding clearance issues.


Wheels are usually stamped with their offset using the German prefix "ET", meaning "Einpresstiefe" or, literally, "insertion depth". An example would be "ET45" for a 45mm offset.


Calculating the offset of a wheel is a fairly easy mathematical equation. First, measure the overall width of the wheel (remember, just because a wheel is 18x7.5, does not mean that the OVERALL width is 7.5”. It means that the measurement between the outboard flange and the inboard flange is 7.5”). Next, divide that width of the wheel by two; this will give you the centerline of the wheel.


Overall width/2 = Centerline


After determining the centerline, measure from the hub-mounting surface of the hub to the edge of the inboard flange (if the wheel were laying flat on the ground – face up – your measurement would be from the ground to the hub-mounting surface). This is your back spacing.


Back spacing - Centerline = Offset





for the people with ADD and can't read all that.. positive means the mounting surface is in front of the dotted line, and negative offset means the mounting surface is behind the dotted line

http://i57.photobucket.com/albums/g202/doug118/offset.gif

[the dingo]

To maintain handling characteristics and avoid undue loads on bushings and ball joints, the car manufacturer's original offset should be maintained when choosing new wheels unless there are overriding clearance issues.

:rofl

[Ericdd]

Wikipedia has a really good explanation of offset, its the most understanding from all of the other ones I've seen

The offset of a vehicle's wheel is the distance between the centerline of the wheel and the plane of the hub-mounting surface of the wheel. It can thus be either positive or negative, and is typically measured in millimeters. Offset has a significant effect on many elements of a vehicle's suspension, including suspension geometry, clearance between the tire and suspension elements, the scrub radius of the steering system, and visually, the width of the wheel faces relative to the car's bodywork.

Zero Offset - The plane of the hub mounting surface is even with the centerline of the wheel.
Positive Offset - The plane of the hub mounting surface is shifted from the centerline toward the front or outside of the wheel. Positive offset wheels are generally found on front wheel drive cars and newer rear drive cars.
Negative Offset - The plane of the hub mounting surface is toward the back or brake side of the wheel's centerline.


"Deep dish" wheels typically have negative offset or a very low positive offset.


To maintain handling characteristics and avoid undue loads on bushings and ball joints, the car manufacturer's original offset should be maintained when choosing new wheels unless there are overriding clearance issues.


Wheels are usually stamped with their offset using the German prefix "ET", meaning "Einpresstiefe" or, literally, "insertion depth". An example would be "ET45" for a 45mm offset.


Calculating the offset of a wheel is a fairly easy mathematical equation. First, measure the overall width of the wheel (remember, just because a wheel is 18x7.5, does not mean that the OVERALL width is 7.5”. It means that the measurement between the outboard flange and the inboard flange is 7.5”). Next, divide that width of the wheel by two; this will give you the centerline of the wheel.


Overall width/2 = Centerline


After determining the centerline, measure from the hub-mounting surface of the hub to the edge of the inboard flange (if the wheel were laying flat on the ground – face up – your measurement would be from the ground to the hub-mounting surface). This is your back spacing.


Back spacing - Centerline = Offset





for the people with ADD and can't read all that.. positive means the mounting surface is in front of the dotted line, and negative offset means the mounting surface is behind the dotted line

http://i57.photobucket.com/albums/g202/doug118/offset.gif


this is great, you guys should make it a sticky :eyebrows