Metal4Life..95s14 wrote:another question when people say like +15 does that mean adding +15 to the +40 offset, which would then mean +55 total?
Good lord no! It means that they are running a +15mm offset which is 25mm less than a +40 offset. It's subtraction, rather than addition.
The lower the offset number is, the further the outside edge of the wheel protrudes from the hub that said wheel is seated on.
For 240's, generally speaking, you want around +15 to +20 to be flush with your stock fenders. Offsets lower than this start to poke out past the fenders, required mods like fender pulls and/or widebody kits.