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Factory BBP 15x7's had a 4.25" backspace, but the factory tires were pretty narrow. If you want to add more tire width you can use a little additional backspace. Not a lot with a 15" rim though because the rim will hit the suspension/brakes. 4.5" of backspace is pretty much the maximum for a 15" rim.

A 225/60/15 is about the widest you can go on the front with a 15x7 and 4.25" of backspace. Decrease that down to 4.1" and some cars would probably need to stick with a 215. With a 4.5" backspace you might be able to sneak a 235/60/15 on a lot of cars, or just make 225's a lot easier and give some room for a lower ride height.