It's a groom's cake. Chocolate. There are two three-layer tiers, with ganache between the layers. After being supported and stacked, both tiers are iced lightly in buttercream, then covered in black fondant. The treads of the tire were made with a pastry crimper.
The hubcap is vanilla cake, also iced in buttercream then covered in fondant -- and painted with silver luster dust.
And while it may be hard to tell from this photo, the cake is HUGE and HEAVY. Life size to be exact, and it takes two people to carry it very far. It will sit on top of a real tire, for a stack of two.
And in case you are wondering, the groom's family owns a tire shop. The *model number* on the whitewall is the date of the wedding.
This is a cake you won't see every day.
In terms of cool and unusual groom's cakes, it ranks right up there with the wine bottle and cheese platter from earlier this summer.
And the BCS National Championship Trophy cake.