Found this little gem while looking for replacement tires for my 235s
It is the Sumitomo HTR Z. It is a high performance summer tire. And the price. $67ea
Tire calculator shows 1" shorter overall. Which means you would only loose 1/2" in the sidewall from tread to rim.
http://www.tirerack.com/tires/tires.jsp?tireMake=Sumitomo&tireModel=HTR+Z&vehicleSearch=false&partnum=545WR7HTRZ&fromCompare1=yes&place=0