I've run 225/50-16s on GC RS coupes & sedans, bugeye rex wag, and blobeye rex wag, no problems on any of them. Clerance @ rear strut spring perches on the GC was pretty tight, tho. Used stock RS 6-spoke 16 x 7s on all, I love those wheels and have had many sets on many diff cars.
Some tires...