If wet braking matters most
Graded A for wet grip, and nothing else that fits is graded higher. Graded C for rolling resistance. EPREL registration 2744391.

The BMW i7 leaves the factory on 245/50 R19 and 255/40 R21 and 255/45 R20 depending on wheel size, and the 245/50 R19 105Y XL below is the one most owners are replacing. XL is not optional here; it is what the car was type approved on. It is staggered: a 255 section at the front and a 285 at the back, so the two can never be swapped across axles and the rear goes first.
| Generation | Trim | Wheel | Tire size | Load index | Speed | Construction | Marking | Pressure |
|---|---|---|---|---|---|---|---|---|
| Current | eDrive50 and xDrive60 (19in) | 19in | 245/50 R19 | 105 | Y | XL | none | see plate |
| Current | 20in wheels | 20in | 255/45 R20 front, 285/40 R20 rear | 105 | Y | XL | none | see plate |
| Current | M70, and 21in option on other versions | 21in | 255/40 R21 front, 285/35 R21 rear | 102 | Y | XL | none | see plate |
Your own placard is the authority. You will find it on the on the driver's door jamb, on the B-pillar. Where it disagrees with this page, it wins. Match or exceed the size, load index, speed rating and construction class it gives, and use its pressure figure rather than anything printed on the tire.
The square 19in set is closer to its limit than it looks. BMW quotes a 1,810 kg permitted rear axle load for the xDrive60, and two 245/50 R19 105Y tires carry 1,850 kg, a margin of 40 kg.
On the M70, BMW quotes 1,800 kg for the rear axle and fits 285/35 R21 105Y at the back, again 1,850 kg for the pair. Both rears share load index 105 even though one is 40 mm wider.
The 19in is listed only for the eDrive50 and xDrive60; the 20 and 21in sets are staggered by 30 mm, 255 front and 285 rear. Michelin's US data also lists H-rated versions of the 19 and 20in sizes.
How these were chosen. Everything here already clears this vehicle's own load index, speed rating and construction class. Each heading is a question about use rather than a ranking. The whole method.
Graded A for wet grip, and nothing else that fits is graded higher. Graded C for rolling resistance. EPREL registration 2744391.
A winter tire, so a second set rather than a replacement for what is on the car now. Graded D for wet grip. Graded B for rolling resistance, the best of anything here, and that is the figure that shows on the range display. EPREL registration 727673.
Rated below the speed this vehicle left the factory at, which is permitted for a winter tire and is why it carries a T or an R. The load index and the construction class still match. Do not exceed the tire's own rating while it is fitted.
Graded A for fuel efficiency in several of the sizes heavy electric cars use, which is a harder result on a two ton car than it looks.
A studless winter tire built for the weight and the rolling resistance demands of an electric car.
Rated below the speed this vehicle left the factory at, which is permitted for a winter tire and is why it carries a T or an R. The load index and the construction class still match. Do not exceed the tire's own rating while it is fitted.
A high performance summer tire available in the Y rated sizes that heavy, fast electric cars are specified with.
Including the manufacturer's own published figure. Neither source is standing next to your vehicle, which is why the placard still wins.