my speculation....
couldn't go too much bigger in size unless your suspension is already
geared for larger wheels (unless your gonna tweak on it).....and 13" wires are truly hard core lowrider wheels...
although if you are wanting to stay with the wires, some 100 spoke
18" chrome &-or gold K.O. dayton's or mclean's would be sick....but I would't want to have to clean the darn'd things...