Those who may be interested in a tire upgrade on the stock 19" rims:
Stock Setup:
Front: 19"x8.5" rims. 225/45R19 tires.
Rear: 19"x9" rims. 245/40R19 tires.
Upgrade (stock rims):
Front: 19"x8.5" rims. 255/40R19 Tires.
Rear: 19"x9" rims. 285/35R19 Tires.
The stock tires on the Infiniti Q60 are way to skinny for the stock rims which makes the rims prone to curb rash. The new upgraded tires are wider and look very nice on the stock rims and give some protection from scraping your rims on the curb. The wider tires will fill-out the wheel well much nicer too. I put on Michelin Pilot Sport 4S UHP tires and the car is glued to the road. No more sliding and skidding or drifting. :-)