offset question

[subaruesh]

I got 6 stud 14" rims that I drilled. I don't know which car they came from but with a 195/75 tyre and 3" lift they rub at the rear of the gard when turning, just where the mud protector is. I'm not sure how to messure offset but I messured 95 mm from the hub to the edge of the rim (on the outside) and they do look like the stick out a bit. what kind of offset do you guys have? is that to much offset? is it worth bitting/cutting and how to?
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