Anyone ever run this setup? Went to Michelin Pilot sports A/S last and though I liked them want to try something else. Have them with 245/40's up front and 275/ 35's in the back. The only others I would like to try would be the Bridgestone Potenza RE960AS or the Continental Extreme Contact DWS. Bridgestones won't fit without a few miles off on my speedometer. Continentals only make a 275/30 or 40 sidewall. Both throw off speed by +/- 3 mph.

so does any think or have experienced problems with running the same size 245/40's extremes all around? Besides being the best rated AS and having like Continentals in the past, they save about 3-400 dollars compared to the Michelin pilot sport AS's

 

I just purchased a G37S sedan and thought of putting same-width tires on my car but a buddy of mine said that I'd probably introduce some over-steer with the wider tire on the front (ie, matching the rear tire width). If you've got an AWD, this is probably a non-issue...

 

I had '08 coupe S 6MT and ran 245/40/19's all around...Bridgestone Potenza RE 760...
It was fine...no oversteer tires looked fine on rims...and you can rotate them...Neil at TireRack endorsed the fitment....same diameter...no diff on speedo....and not detectable driving it at all....go for it!