I guess it may vary on the car. I have a wheel well in the trunk but it wont fit an inflated spare the same diameter of the actual drive wheels. If I had to guess, it probably will accommodate one of those collapsible spares. My spare is sitting in a carry bag supplied by the vendor. It takes up a lot of room but I'm old school and just cant drive without a spare even if I had run flats.

Odd thing is, we have a '21 GLC and it has run flats that it came with but also has a spare (full diameter) that fits in the wheel well under the deck in the back.

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