225/55R17 is the biggest I know for sure will work but the 235/50R17 you would like to use is about 0.4" shorter and 0.4" wider. So I suspect it might work but really no way to know for sure unless you can find someone here on the forum that has tried it.
Zig Ziegler | The Tire Tire Rack
7101 Vorden Parkway
South Bend, IN 46628
O: 888 428 8355 ext. 4784 firstname.lastname@example.org www.tirerack.com?affiliate=DZ1 Support Club Lexus!!! Click on The Tire Rack banner ad or reference "Zig / Club Lexus" when ordering!!!