Sorry to have to ask this question i have been searching around but this tire stuff gets confusing to me. I have a 05 S2000 on stock wheels. Are the tires and sizes going to be ight for everyday driver?

225/45ZR17 BFGoodrich g-Force T/A KDW 2

255/40ZR17 BFGoodrich g-Force T/A KDW 2

 

Yes.

 

It's a minor point, but personally, I'm in favor of smaller front tires for a DD. Less unsprung weight up front, less footprint, feels lighter/more nimble at the steering wheel. I'd go either:
215/45-17 F, 245/40-17 R (stock AP2 sizes)
or
215/45-17 F, 255/40-17 R (stock AP2 CR sizes)

But sure, 225/45-17 fronts will work just fine and many prefer that size up front. Personal preference.