Off and On Track Tires

[986RennWagen]

I know this topic has been beat to death. Just bought some Ruf Speedline rims

Front: 17x8 Rears: 17x9

I may see the track a couple times a year. Honestly, I only drive a the 986 on the weekends to Cars&Coffee. In the fall/winter, I might drive a few times The big question??? Should I buy track tires.

If so, would 225/40 stretch too much on the fronts. Some are saying 235/40

Then the rears 255/40