17" or 18" Wheels on the 6th Gen?

[Blackteqrunner]

As we wait to get our hands on the 6th Gen, one thing that has changed with this new generation is the wheel size. Traditionally, the Tacoma ran 16" wheels, the 4Runner ran 17" and the Tundra 18" wheels in their off road, base and Pro models. I'm curious as to what size wheel we would be able to run (specifically the smallest) since they have revealed that the Pro 4runner and Trailhunter will have 18" wheels in matte black and bronze respectively. As someone that prefers a smaller wheel and large sidewall for both aesthetic and practical off road purposes, I would love to know if it is possible to still fit 17" wheels on the new gen without running into fitment issues. If I remember correctly, the 3rd Gen Tundra can fit certain wheels in 17" but you run too close to the calipers. My guess is that you should be able to still run your 17's but you'll need the correct offset as well as a tire shop that knows how to balance the tires properly. What size wheel would you run?