They are 17 x. 7.5". Phat Kat racing.
I wanted to stick with a stock size only because I had just put on a new set of Michelin premier V rated tires on last summer.
In hind sight. I should have gone to 18" last year when I was shopping for tires. There are a lot more options with 18" and larger for rims.
17's are cheap nowadays. They are today's new 14".