Offset for 20 inch rims

[numbbers]

I have been working with our wheel and tire forum sponsor, on a set of 20 inch rims and tires. Although I trust them completely, I just wanted to get some of you personal experiences and opinions with the best offset for 20x8.5 rims, with 245/35-20 tires. I just want to be sure that what I buy, is not going to cause me any rubbing or handling issues.

[mena661]

You might want to ask Road-Runner-I over on the sky forum. He's got some custom 20's on his Sky's.

[KappaKadet]

Your setup looks about right, just a couple of millimeters taller than OEM,
with the extra half inch rim width you might want to push out the offset a wee bit,
say about a quarter inch, to 48mm, though it's probably not necessary.


to discuss with your vendor.

[AtomicMan]

OK, I'm going to ask a stupid question, but I've been wondering this for a while. What exactly is an offset?

Thanks in advance

[LowLife1]

From Wikipedia.com
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

Source: American Racing Wheels