BMW M340i Spare Tire Sizes
The BMW M340i has used a 5x112mm bolt pattern for all models from 2020 to 2023 along with tire diameters ranging from 26.0" to 26.1" tall. Using a temporary spare tire with a diameter close to the standard tire has many benefits, especially for modern vehicles with larger brake calipers and anti-lock brakes or traction control systems. Tire diameter as well as wheel diameter clearance have been taken into account for the specific BMW M340i years and options. In this case, a 145/70R18 temporary spare tire is the recommendation for all applications.