because the car rides on Super Comp springs I wanted to run a slightly shorter tire than the stock 23.7" to keep a nice fender gap and clearance
my choices for size where 185/55 (23.01"), 195/55 (23.44) , 205/50 (23.01) , the 195/55 is the popular choice and would have worked fine but because the wheel are 15x6 i wanted to use a tire that sits more squarely on the rim so I opted for 185/55
there is not ton of choices in that size but Yokohama's Advan Fleva was available .
The Fleva is part of the Advan line of UHP and Max performance tire and direct replacement of the SDrive.
I've only put abot 250 miles on them of very spirited driving so far but I have to say I'm very impressed with this tires ,
turn in is crisp and the feedback is a clear and precise, it feel like it will take a lot of overdriving to reach the limit of these tires on the street. I like them much better that the Toyo Proxes 4 I had on the other car (which are being replaced by Firestone Indy 500)

