I am making an cake in the shape of a truck and want the tires to look Normal. (not sitting gobs of icing or just stuck to the side of the cake) I have seen some tires where the cakes are setting on some sort of blocks? Are these styrofoam? Or more cake? It is a rather large cake (feeds 50 people) so it will be heavy. I was planning on covering donuts with fondant to make the tires. Other ideas?
Here's an idea from the cake I did for a car. Use a round cookie cutter the size of the tire you want to make. Melt white candy melts and tint it black using CANDY tint not icing tint. Pour the melted candy in the cookie cutter to the thickness you want the tire to be and put in the freezer for a couple of minutes. It will pop out really easy and then make another one. Make a couple extra to allow for breakage. Use a couple of toothpicks to mount onto the cake (yes, set your truck on a wrapped styrofoam block) and then pipe grey rims from icing. Don't pipe the rims before you mount the tires, much better doing as the last thing. Best of luck to you!
use semi truck as your search word and you will find instructions....there is also one under the Wilton Website...use semi truck as searchword also. I used styrofoam blocks and and covered the with foil then used melted candy to attach oreos and piped hubcaps in center of each one.
I used crueller donuts from the local donut shop and I covered them in wilton premade chocolate icing tinted black and then microwaved.It kinda came out smooth and waxy but the look was great.Check out my photos and you'll see the monster truck cake.
For the 3D jeep cake I did, I took my measuring cup and filled it with aluminum foil and packed it down tight to the width I wanted. When I took it out (after trial and error), I wrapped it in a paper towel before wrapping in fondant. Before I figured out the paper towel, the foil creases and all would show through the fondant. Then I made the "rims" out of fondant and painted them with silver then glued them on the tires with piping gel.
We used the big bagels. Much sturdier than the donuts and stood up perfectly! We covered them with mmf fondant colored black. Ours was on a tractor that had a trailer, and on the trailer we used mini bagels.
Of course, you couldn't EAT it (I suppose you could), as I'm not sure how it'd taste (LOL), but this was for *my* baby. 
Tina
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