My Spridget has flared fenders front and back. It was previously used to autocross. It currently rides on 175 tires on 13 inch slotted mag wheels. I think they're five or 5 1/2 inches wide. I'd like to switch to the four spoke mag wheels I've seen. I suspect 205/60 – 13 tires on 7 inch wide wheels would fill out the flares. What sizes do racers use?