I just had my winters put on (that I've had for 2 years now) and noticed walking up to my car today that the front wheel well of the car looked to have a lot more room above the tire than the rears. This could be normal however I''ve never noticed it before. I am concerned as I believe my rear winters (dunlop winterspot M3's) have shifted belts in them and causing some intermittent vibration (sometimes as bad where I see my passanger seat virbrating at 120 kms/hr) however I don't see how shifted belts could cause this

Is this normal or does anyone have any ideas as to what could be causing this problem?

Specs:

2008 G35X sport (no mods)

summer rims/tires (stock 18")

winter rims/tires (ASA 17" alloy, Dunlop Wintersport M3)

Space between front tire and wheel well (3.25")

Space between rear tire and wheel well (2.25")

Any feedback is appreciated