Quoting Tre3zy:
hey guys just wanted to know if +42 offset on a wheel for our cars is too much.... wanted to get this wheels for my galant
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+42 is not agressive, the lower the number the more it is considered to be agressive ( so a +38 is considered to more agressive than a +40). The higher the number, the closer it is to the suspension. A lower offset means that the wheel will be further away from the suspension = closer to the edge of the fender well. I run a 18 x 7.5 +40 and I've used a 17 x 7.5 +44 in the rear in the past so that wheel should fit without issue.
Daryl