305/35/22 vs 315/35/22 tires

[Tracked]

I know this has been posted in a couple different threads, but I wanted to make a consolidated one as searching the forum using just tire sizes doesn't return results.

Wheels: 22x10.5", 30 offset

Why is 305/35 generally recommended over 315/35? The 315s appear to be closer to the 30.7" od and fill in the wheel gap just a bit more than 305s. Is 305/35 more widely used purely for esthetics over the 315? Or is there a functional reason as well such as 315s potentially rubbing?

Also, for future forum users searching for tire sizes: 305/40/22 physically fits, but can rub front wheel liners depending on the tire brand. It does look the best though IMO

 

[UNBROKEN]

Because most of them rub if you’re lowered and the cost of a name brand tire is astronomical. My last set of 315/35’s was $2700 plus mount and balance and I got 15K miles out of them. The cost benefit isn’t there. They tramline like crazy and I also had to replace the front fender liners.
A 305/40 will run into the same rubbing issue when lowered on most tires. There’s a few that run narrow that clear but most will rub.
When I did the math on fitment for lowered cars and came up with the 10.5 +30 wheel fitment, the 305/35 was the best compromise between a wide tire and absolutely zero rubbing. It’s become the go-to fitment because of that. If someone doesn’t mind the tire rubbing the other sizes are out there to play with.

 

[Tracked]

Ah OK, I didn't see on other threads about the 315s also potentially rubbing in certain spots.