Not sure if they do.
I use one of the front 20's as the spare. Did so a couple weeks ago on the first road trip; it does take up a lot of room, but I was still able to fit two rollerboard suitcases in the trunk.
I do the same thing in my M3.
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Garage:
09 E90 ///M3 | SS | Black | Modded
22 992.1 GT3 | Black | PCCB | LWB | PDK
23 G82 ///M4CSL | AW | Race Buckets |
24 9YO Cayenne TGT | QGM| Burgundy | Neodyne / PCCB
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