Quick Question
Offsets are a measurment in mm of how off the center of the wheel is from true center (not looking at the face of the wheel but imagine looking down at a wheel as if the barrel was invisible). For my example I will use a 10" wide wheel. Offset 0 would mean that on a 10" wide wheel, there would be 5" on each side of the center of the wheel.
negative offsets equal more wheel toward the outside of wheel
positive offsets equal more wheel on the inside (the hub side).
Practically you can put a ruler at the top of your wheel to see how much space you have between the wheel and the fender - you are cool when there is virtually no space - then your wheels are "flush". after you measure that space keep that number in mind.
Choose how wide of a wheel you want, then run through the offset calculator that someone will link in this thread shortly. You can figure out how wide and what offset will move the wheel out towards your fender that way.
negative offsets equal more wheel toward the outside of wheel
positive offsets equal more wheel on the inside (the hub side).
Practically you can put a ruler at the top of your wheel to see how much space you have between the wheel and the fender - you are cool when there is virtually no space - then your wheels are "flush". after you measure that space keep that number in mind.
Choose how wide of a wheel you want, then run through the offset calculator that someone will link in this thread shortly. You can figure out how wide and what offset will move the wheel out towards your fender that way.
Last edited by Thermal1; Oct 20, 2008 at 11:19 AM.
Offsets are a measurment in mm of how off the center of the wheel is from true center (not looking at the face of the wheel but imagine looking down at a wheel as if the barrel was invisible). For my example I will use a 10" wide wheel. Offset 0 would mean that on a 10" wide wheel, there would be 5" on each side of the center of the wheel.
negative offsets equal more wheel toward the outside of wheel
positive offsets equal more wheel on the inside (the hub side).
Practically you can put a ruler at the top of your wheel to see how much space you have between the wheel and the fender - you are cool when there is virtually no space - then your wheels are "flush". after you measure that space keep that number in mind.
Choose how wide of a wheel you want, then run through the offset calculator that someone will link in this thread shortly. You can figure out how wide and what offset will move the wheel out towards your fender that way.
negative offsets equal more wheel toward the outside of wheel
positive offsets equal more wheel on the inside (the hub side).
Practically you can put a ruler at the top of your wheel to see how much space you have between the wheel and the fender - you are cool when there is virtually no space - then your wheels are "flush". after you measure that space keep that number in mind.
Choose how wide of a wheel you want, then run through the offset calculator that someone will link in this thread shortly. You can figure out how wide and what offset will move the wheel out towards your fender that way.
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 in Inches
Inches x 25.4 = Offset in mm
wikipedia
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 in Inches
Inches x 25.4 = Offset in mm
wikipedia
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