The 235/40/17 size tires are not available, at least for me in a matching set. It was my first choice and I have been looking at this stuff for weeks (kind of maddening). The 225/45/17 diameter is .6 inches larger. Thus the car sits .3 inches higher. Jerry Sackett recommends the 225/45/17 on his website for the front tires on the wheels that he sells. I asked Wilkinson and he said the diameter of the 225/45 is close enough.
As I wrote earlier, tires for our cars can be difficult to obtain. My first choice for the rears was 335 instead of 315 but I cannot find them in a matching set.
Good question. Thank you.