BMW X3m40i Tires

Excellent in every way, very good comfort, quiet, good grip on dry and wet roads

The Bridgestone Alenza RFT in 245/40R21 front and 275/35R21 rear is a very average tire. It’s okay but not great. Grip is acceptable in dry conditions, but in the wet it can slip when pushed, although the AWD system helps manage it. Ride comfort is harsh, with noticeable thumping over bumps and poor handling of rough roads. This is typical of run-flats, but still disappointing at this price point. Feedback and progression near the grip limit are minimal, making spirited driving feel numb.

Wear has been reasonable. After around 40,000 km, the fronts have about 5 mm of tread left while the rears are down to 2 mm. The front tires show noticeable outer edge wear, likely from SUV weight transfer during cornering. Running higher-than-recommended front pressures helps mitigate this.

Overall, it’s an expensive tire with no standout qualities. The limited run-flat alternatives in this size make that more frustrating.

I bought and mounted these tires 7 months ago, for the last winter, driven less than 10'000 km. Changing back to summer tires on my BMW X40i and guess what? I have to throw the Blizzak tires away, because they are worn out! No aggressive driving, no heavy load, almost no driving in warm weather (a few hundreds of km in the Spring). They are gone. I never saw something like this. That means, goodbye Bridgestone!

Tires lasted 20k on rear and 22k on rear (second set) and 42k on fronts. 4wd x3m40i that gets driven hard but a lot of motor way mileage.