The early-2010s era Infiniti Q70 was a full-size luxury sedan that was developed from the M series and was available with a wide selection of engines, drivetrains and option packages. Essentially an update of the M series of sedans, the Q70 is a strong performer and easily a head-to-head competitor with similar models from BMW, Audi and Mercedes-Benz, and is of course loaded with the kind of high-tech features that Infiniti drivers have come to expect. Your Q70 would have left the factory with Bridgestone Potenza RE050A, Bridgestone Potenza RE97AS or Michelin Primacy MXM4 tires as OEM.
When it’s time to shop 2015 Infiniti Q70L tires, remember that your tire sizes could be 245/40R20 or 245/50R18. Your best bet will be performance-oriented premium all-season tires like the Firestone FireHawk A/S (with 50k mile treadwear warranty), Nokian WR G4 (60k mile warranty) or Yokohama Advan Sport A/S (55k mile warranty). For more spirited driving, check out summer and ultra-high-performance tires like the Kumho Ecsta PS31 or Yokohama Advan Sport V105. Just remember that summer/UHP tires use a softer, stickier tread compound that delivers great cornering and braking, but will stiffen and lose traction on colder days. Summer/UHP tires shouldn’t be used when temperatures are below 40-45 degrees F.