Been shopping online for wheels and what does, example ET -12 mean, I know I need a min of 4.75" of back spacing is this what ET means, a bit confused on this

 

??

I dunno.

can you give an example in context of where you read this?

 

I believe "ET" stands for the wheel's offset...See the info below...Hope this helps a little...



" Offset is the distance from a wheel's mounting surface on the hub to the centerline of the wheel, in millimeters. Negative offset means the mounting surface is towards the inside of the wheel. With positive offset, this surface is biased towards the outside. Typically, wider tires require more positive offset to avoid contact on the inner fender well. "