largest tire on 14" rally wheels

I have 215/70-14s and they managed to survive a track day at Willow Springs, so no problems there.

225s on the front of a 2nd-gen Barracuda are iffy, I've heard -- they tend to catch the front edge of the wheel opening at full lock under loading (like when you make a tight turn up a steep driveway). I haven't had any problems with the 215s in this respect, even with the stainless trim.