There's nothing wrong with moving your centerline outboard. It's called a wider wheelbase and Pontiac made it their advertising campaign!

Seriously, a wider stance can be shown to be more stable...though we're not talking much. The +15 offset is what I'd pick too. It's what I bought...and can be seen in this thread. Notice LDub's tires will be exactly the same as yours. (I'm referring to his first pic in the linked thread).

Mine are bigger in diameter --- since they're 285's.

I can see where 285/60's would be too big -- unless you're willing to do some moderate trimming. I had to do a bit -- with smaller 285/50's. But, mine is undetectable. (Unless you compared to a stock, unmodified bumper).

265/50's for sure would be small enough to fit w/o any trimming. Even with the extra negative (outboard) offset. IIRC, they'll be about 1.5" smaller in diameter than my tires. And, I did NOT have to remove that much material.

You'll be fine with 15mm offset...and it's what I'd pick. Unless you really like the inset wheel look. 38mm will also work. So really, it's a matter of personal taste on how you like the wheels positioned (flush or inset).

Look how my 15mm 20x9's look! Your's will even be a hair further inset...


Then, look at Dub's to get a good idea how they'll fill out the wheel well.