Michelin Pilots are high performance tires. Did you say the other tires you bought are All-Season? That's why the sidewall profiles are different size. All season tires are designed to be more comfortable meaning you will have a larger sidewall for better cushioning. Never mixed tire types. The car doesn't know what you want out of it. It's receiving different inputs from front and rear. Get one brand. Don't buy a G35 and be cheap. I don't usually say things that might offend but fact is fact. A performance car requires more expense to maintain. Change those tires to Michelins.

 

ps, thanks everyone

 

Where do you live that you wanted all-season tires?
what are you going to do w/ your tire situation?

 

Regardless of actual weather conditions, besides it being bearable in the snow here which is nice.. One of the main reasons I wanted to go with A/S tires on my G is because of the comfort level. The G honestly is as smooth as my Benz right now, I can't believe how nice and smooth it rides. The comfort level is now 10 times better, and even friends have commented on how much smoother my car felt after I made the switch.

I don't really have the need to fly into turns at 75MPH anymore, so for the 99.9% of the other time of straight driving a smoother ride is much appriciated, and the handling on these tires are still great. Not to mention they aren't going to suffer from the noise and treadlife issues of the Pilots.