BMW M850i xDrive Spare Tire

The BMW M850i xDrive is a sophisticated and high-performance luxury vehicle, equipped with run-flat tires as a standard feature, which sounds like good news for drivers concerned about flat tires. However, as a tradeoff for the added safety of run-flat tires, the BMW M850i xDrive does not come with a spare tire. It uses Bridgestone Potenza S007 run-flat tires size 245/35R20 in front and 275/30R20 at the rear. These tires are designed to resist the effects of deflation when punctured, providing enough stability and distance capabilities to reach a service station or tire shop, eliminating the need for carrying a traditional spare tire. This feature allows BMW to design the vehicle with more room for passengers and cargo, and less weight for fuel efficiency, but it also means you would need to replace the tire sooner than having it repaired or replaced with a spare.

BMW M850i xDrive models manufactured from 2019 to 2025 have tires with overall diameter ranging from 26.7" to 26.8", allowing the use of a temporary spare tire with a near same diameter as the OEM tire. Tire diameter and wheel diameter clearance have been taken into account for the specific BMW M850i xDrive years and trims.

Listed below are compact spare tire sizes that can fit some BMW M850i xDrive vehicles based on acceptable tire diameter range of 25.9" to 27.6". Some M850i xDrive models may require the use of a traditional full-size tire as a spare. To ensure safe temporary mobility in case of a road emergency, always refer to the vehicle owner's manual for the correct BMW M850i xDrive spare tire size designated by vehicle's manufacturer.

Spare Size	Spare Diameter
T145/60R20from $271.36	26.9"
T145/80D18from $257.05	27.1"
T155/70R18from $178.60	26.6"
T165/80R17from $166.85	27.4"
T135/90R17from $158.19	26.6"
T135/70R19from $147.99	26.5"
T145/65R20from $146.43	27.4"
T135/80R18from $125.96	26.5"
T165/80D17from $124.93	27.4"
T145/70D18from $118.97	26"
T155/80D17from $97.90	26.8"
T155/90D16from $92.99	27"
T145/90D16from $88.99	26.3"
T145/80D17from $81.99	26.1"
T155/80R17	26.8"
T155/90R16	27"
T165/70D17	26.1"
T165/70D18	27.1"
T165/70R17	26.1"
T165/70R18	27.1"
T185/55D18	26"
T155/70D18	26.6"
T145/90R17	27.3"
T145/90R16	26.3"
T145/90D17	27.3"
T145/80R18	27.1"
T145/80R17	26.1"
T145/70R18	26"
T135/90D17	26.6"
T135/80D18	26.5"
T185/55R18	26"

Spare Tire for BMW M850i xDrive

Discover spare tire solutions for your BMW M850i xDrive based on model year. Generally, spare tire size has to be within 3% of the overall diameter of the original equipment tire size. BMW M850i xDrive tire size can vary depending on the year and trim. Make sure to check the load index and load capacity of the spare tire to ensure that it is capable to safely support your vehicle's weight.

All listed guides, data and/or calculations are for informational purposes only. Spare-Tires.com does not warrant or make any representations regarding the accuracy of or the results of the use of this information. Always refer to vehicle owner's manual for the correct spare tire size configuration.