I am doing my first hexagon wedding cake and the bride would like a 5 tiered hexagon cake, but I'm only fining hexagon cake pans for a 4 tier cake....6", 9", 12" and 15".   I have Googled and searched all the places where I usually purchase my supplies and this is all I'm finding.   Are there some other sizes out there in a brand I'm not finding??   Thanks for your help!!

I don't know of any hexagon pans larger than a 15".  You could however, cut a hexagon out of an 18" round pan. 

I measured my 15" hexagon and the sides are 7 1/2" so if you wanted to go with an 18" hexagon you would need to make the sides 9" each.  You could also draw a template the size you need and work with a very large layered sheet cake to cut the shape out of.  The sides will be a pain in the butt to ice because they will be raw but it's doable. 

Hope that's helpful.

AI believe fat daddios has a hex cake set. Also, you could cut them yourself using round cakes and a template off the computer. Just find a nice hex, and print and take it to kinkos, and ask them to enlarge it to 6,9,12,,15, 18, or whatever. Then cut it out and place on your rounds and trim. It will be trouble, and wasteful, but cheaper than buying a set of pans you seldom use! Mine have been used 3 times in 6 years!

Thank you so much MissLisa! :)   And Annabakescakes....that's not such a bad idea....I have a feeling I will buy these pans and only use them once!   I just worry about the structure of the bottom when it's a trimmed cake.  And I can't find a hex cake dummy larger than 14 or 15" either or I would go that way on the bottom.

I am currently making a 5 tier hex cake, with an 18" diameter on the bottom.   I searched and finally concluded that the largest size hex that is available is 15".  As mentioned above, an 18" hex can be cut from an 18" circle, but the largest dimension my oven can accomodate is 18 by 16.  An 18" hex is 18 across the points, and a little over 15.5 flat to flat side, so the  18" hex would fit.  I researched having one made, but with start up costs, etc, and minimum orders, the best price was over $1000!!  I'm a little crazy, and I love a challenge, so I made my own pan.  It works beautifully.  It is the same gauge as magic line and fits in my oven perfectly. Next time I will make sure the pans are available before getting my heart set on a certain design.   

AI have never used one of my scratch recipes with the cut, raw edges, but I have used box cake, made with milk and a dry pudding and had the cut edges. It worked just fine. I was nervous, but after I crumb coated, it worked just the same.

KimKakes, you may want to consider renting the pans too if you have a supply shop close by that offers that service.