depend what kind of bridgestones they are, some hi end models are ok on the Q.
Generally tires dont last nearly as long as most PPL think, Even on a luight car w/ a good tire (which does not always mean hi "treadwear" rating), I wouldnt put on more than 30,000 miles on a set as the belts insiede will be mostly broken by that point even if tread looks good.
On heavy cars you will rarely see more than 25k safe miels even iof teh tread looks good.Since can be easily checked by seeing if the tire hold its balance.
A Q45 or BMW 7 series wille xacsberate this problem due to the high negative camber in the fronts ( neccicarry of you want to make big cars handle well).
Even the best tires (Michelin pilots, Firehawk SZ50EP's) I wont leave on a Q for more than 20,000 miles.
So those tires are likely at the half way point.
I would make that pruchase for the wheels sake if you like them and the price is definetly right at $200, Infinti factory wheels are hi quality in roundness and strenght.
Also it never hurts to have 2 sets of wheels, one with summer/performance tires and one w/ winter tires.
Fred...
