? Check that?
E70-14 tires should be about 25.3" diameter
F60-15 would be close to 26" diameter.
Yup. 225/50 - 15 is a good size for competition tires. Price, availability, and lower both the cg and roll axis while providing lower gearing on the course. It's still big enough to support the load of a 3200 # car.
Everyone has to find their own comfort zone. The Green Brick's biggest claim to fame was running the One Lap of America, at least twice very successfully.