Rim Offset - How to measure it and get it right

[MudRunnerTD]

thanks for the above info MR
i have a question? i measured my offset this afternoon and i got a measuremnet of 101mm from the bead to the front side of the mounting plate and 95 from the bead to the mounting plate on the back side?? would this mean i have almost a 0 offset??
my next question? would this be an ok offset to run a 33 12.5 tyre oh and its a 15x8 rim.

thanks
Gav

You need to measure through the centre hole to the back mounting face for the front offset to be accurate. The thickness of the centre plate must be measured as part of the front measurement. Measure again. You have the back side so you should be able to get the front with the wheel on the car if you have put it on already.