I have a chance to buy New Michelin Pilot sports PS2 (Great Price private owner) Fronts 225/40/19, Rear 245/40/19. I know the rear size is good, but will the front size have a Problem? i new to this site.I have a 2012 G37 Journey Coupe. Thanks for any help!

Welcome to the site! Yeah, the rear are the same size, the fronts are a bit smaller in diameter. You can see the difference in a "tire calculator" available online. The ones you have on front are about 84.74" in diameter and these new tires are only about 81.95" in diameter. Technically, they'll fit on your car. Your speedo is in the rear, so I think you're good there since these would go on the front. But, they're the wrong size, so unless they're like 25-50 bucks each and you're broke and your tires are bald, I'd pass on those fronts. That's my opinion.

Thanks for the info. That's what I thought! I went with Continental Extreme Contact DWS 06 a all season tire! 225/45/19--245/40/19 Work for me! I have had good luck with the Continentals I have them on my Pantera.

Great choice! I don't mind compromising on some things to save a few $$, that's why I drive a 240sx. But having the wrong stuff, even if cheaper, is usually not worth it, it's just wrong.