oh gosh...ok here we go.
10" wheel with +40 offset vs. 11" wheel with +15 (super deep concave)
its 38mm "more aggressive" (for lack of a better term), or 38mm more towards the outside. Add in a chunkier beefier tire that most of us almost always decide to run. is there almost 2" of space to work with on the outside?
an 11" with +25 could possibly work as it is about an inch more out...but with fatter tires maybe close again.
with the stock size wheel its exactly like putting a 15mm spacer to the stock wheel (going to +25 from +40) but who wants stock sizes?!
id imagine ppl putting wider wheels, fatter tires on the new car with all that power.
this is what i was talking about.
I sure didnt need an offset calculator for that but i guess ppl need specifics in here