the 240's and 250 go on an 8.5" rim.....that's all, anything less is redundant.
the jump is from 210 to 240, really nothing inbetween, the 240 won't fit in the rails, (unless you squish it on a rim that's thinner than what should be).
be thankfull for what it is, could be worse, stay tuned for the Sabre.
Don't make any plans soon for a 18x6.25, I doubt it will happen unless a whole lot more OE's jump on that size.
ever thought about doing the 17 x 6.25 and running a Metz?????
We have that blank. I think it would look good.