For BMW i3s with 19-inch wheels, Tyres.co.uk has the Bridgestone Ecopia EP500 and Nankang ICE-1 in 155/70 R19 84Q. If you want a summer tyre, go with the Ecopia. If you want a winter tyre, go with the ICE-1, since it is 3PMSF marked; other BMW i3 wheels have different front and rear fitments.
The size of BMW i3 tyres, along with the optimal air pressure, can be located on the BMW i3 tyre pressure placard located on the driver’s side rear door. This requires you to open the driver’s side door. The size is listed on the sidewall of the tyre, while the placard and the vehicle handbook provide the optimal specification.
All versions of BMW i3 are rear wheel drive, so there is no need to purchase same brand and model of tyres for all 4 wheels. Tyres can be purchased and fitted by the axle. The UK recommends fitting new tyres to the rear axle, and it is possible to retain the front and rear differences in specifications.