BMW 645Ci Spare Tire
The BMW 645Ci, a high-performance luxury car, typically does not come with a standard spare tire due to its emphasis on performance and design. Instead, it usually employs run-flat tires designed to resist deflation even when punctured, allowing the vehicle to continue to be driven at a reduced speed for a limited distance. However, in some cases, a driver may choose to carry a spare tire. The size of the spare tire for a BMW 645Ci should match the regular tires. For this model, the standard size is typically 245/45R18 for front tires and 275/40R18 for rear tires, where the first number refers to the width in millimeters, the second is the aspect ratio, and the third is the wheel diameter in inches. But one should always double check the tire size information specific to their vehicle model and year as variations can occur.
BMW 645Ci models manufactured from 2004 to 2005 have tires with overall diameter of 26.7", 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 645Ci years and trims.
Listed below are compact spare tire sizes that can fit some BMW 645Ci vehicles based on acceptable tire diameter range of 25.9" to 27.5". Some 645Ci 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 645Ci 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 645Ci
Discover spare tire solutions for your BMW 645Ci based on model year. Generally, spare tire size has to be within 3% of the overall diameter of the original equipment tire size. BMW 645Ci 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.
| Vehicle | Recommended Spare |
|---|---|
| 2005 BMW 645Ci | 31 compact spare tires fit the OEM tire diameter range of 25.9" to 27.5" |
| 2004 BMW 645Ci | 31 compact spare tires fit the OEM tire diameter range of 25.9" to 27.5" |
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.