how to find out wheel's offset

[adriannsx]

I have a set of rims and do not know its offset. Is there anyway to find out?

 

[PaulL]

You can measure them ...
http://www.tirefactory.com/img/offset.gif
http://www.1010tires.com/WheelOffsetCalculator.asp
http://en.wikipedia.org/wiki/Offset_(wheel)

 

[RP-Motorsports]

if you take the wheel off, sometimes there is a sticker or stamp on the inside of wheel. Look at the back of the spokes for a cast stamp, or on the inner lip for a sticker.

If you measure 25.4mm to an inch

 

[nsx1]

It's so simple to measure...

Take the wheel off and lay it face down (brake side up) on the ground.
Take a long, straight stick and lay it on top of the tire.
Measure from the bottom of the stick to the ground. (Example: 7.5 in.)
Measure from the bottom of the stick to the mounting surface. (Example: 5.25 in.)

The measurement to the ground "divided by 2" equals the centerline. So, take that measurement to the ground divided by 2 and subtract it from the measurement to the mounting surface.

If you measured it in inches, multiply the result by 25.4 to convert to millimeters.

Example:
Width (measurement to the ground) = 7.5 inches.
Depth (measurement to the mounting surface) = 5.25 inches.
Calculate centerline: 7.5 / 2 = 3.75 inches.
Calculate offset: 5.25 - 3.75 = 1.5 inches.
Convert to millimeters: 1.5 * 25.4 = 38.1mm
So the offset would be +38mm.


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[Hapa88]

if you take the wheel off, sometimes there is a sticker or stamp on the inside of wheel. Look at the back of the spokes for a cast stamp, or on the inner lip for a sticker.

Yeah, look for a number like "+38" or "ET38"