I've got a non-standard set of rims and I'd like to know what Offset they are as I believe they are incorrect for the car they are on.
I have a rough idea what Offset means but how do I easily and accurately measure the Rim Offset?
Can it be done while the wheels are on the car or do I have to remove one?
Can it be done without removing the tyre from the rim?
Is it likely that the offset is stamped somewhere on the rim (I can't see it, but maybe I should look harder)?